Bandwidth part switching

ABSTRACT

Message(s) are received that comprise configuration parameters of a cell. The cell comprises a first downlink BWP, a second downlink BWP and uplink BWP(s). The configuration parameters comprise: first parameters of first uplink control channel resource on the at least one uplink BWP for first CSI reports of the first downlink BWP; and second parameters of second uplink control channel resource on the uplink BWP(s) for second CSI reports of the second downlink BWP. The first CSI reports of the first downlink BWP are transmitted via the first uplink control channel resource on an uplink BWP of the uplink BWP(s). An active BWP is switched from the first downlink BWP to the second downlink BWP. The second CSI reports of the second downlink BWP are transmitted, after the switching, via the second uplink control channel resource on the uplink BWP of the uplink BWP(s).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/587,074, filed Nov. 16, 2017, and U.S. Provisional Application No.62/587,165, filed Nov. 16, 2017, which are hereby incorporated byreference in its entirety.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Examples of several of the various embodiments of the present inventionare described herein with reference to the drawings.

FIG. 1 is a diagram depicting example sets of OFDM subcarriers as per anaspect of an embodiment of the present disclosure.

FIG. 2 is a diagram depicting an example transmission time and receptiontime for two carriers in a carrier group as per an aspect of anembodiment of the present disclosure.

FIG. 3 is a diagram depicting OFDM radio resources as per an aspect ofan embodiment of the present disclosure.

FIG. 4 is a block diagram of a base station and a wireless device as peran aspect of an embodiment of the present disclosure.

FIG. 5A, FIG. 5B, FIG. 5C and FIG. 5D are example diagrams for uplinkand downlink signal transmission as per an aspect of an embodiment ofthe present disclosure.

FIG. 6 is an example diagram for a protocol structure withmulti-connectivity as per an aspect of an embodiment of the presentdisclosure.

FIG. 7 is an example diagram for a protocol structure with CA and DC asper an aspect of an embodiment of the present disclosure.

FIG. 8 shows example TAG configurations as per an aspect of anembodiment of the present disclosure.

FIG. 9 is an example message flow in a random access process in asecondary TAG as per an aspect of an embodiment of the presentdisclosure.

FIG. 10A and FIG. 10B are example diagrams for interfaces between a 5Gcore network (e.g. NGC) and base stations (e.g. gNB and eLTE eNB) as peran aspect of an embodiment of the present disclosure.

FIG. 11A, FIG. 11B, FIG. 11C, FIG. 11D, FIG. 11E, and FIG. 11F areexample diagrams for architectures of tight interworking between 5G RAN(e.g. gNB) and LTE RAN (e.g. (e)LTE eNB) as per an aspect of anembodiment of the present disclosure.

FIG. 12A, FIG. 12B, and FIG. 12C are example diagrams for radio protocolstructures of tight interworking bearers as per an aspect of anembodiment of the present disclosure.

FIG. 13A and FIG. 13B are example diagrams for gNB deployment scenariosas per an aspect of an embodiment of the present disclosure.

FIG. 14 is an example diagram for functional split option examples ofthe centralized gNB deployment scenario as per an aspect of anembodiment of the present disclosure.

FIG. 15 is an example diagram for synchronization signal blocktransmissions as per an aspect of an embodiment of the presentdisclosure.

FIG. 16A and FIG. 16B are example diagrams of random access proceduresas per an aspect of an embodiment of the present disclosure.

FIG. 17 is an example diagram of a MAC PDU comprising a RAR as per anaspect of an embodiment of the present disclosure.

FIG. 18A, FIG. 18B and FIG. 18C are example diagrams of RAR MAC CEs asper an aspect of an embodiment of the present disclosure.

FIG. 19 is an example diagram for random access procedure whenconfigured with multiple beams as per an aspect of an embodiment of thepresent disclosure.

FIG. 20 is an example of channel state information reference signaltransmissions when configured with multiple beams as per an aspect of anembodiment of the present disclosure.

FIG. 21 is an example of channel state information reference signaltransmissions when configured with multiple beams as per an aspect of anembodiment of the present disclosure.

FIG. 22 is an example of various beam management procedures as per anaspect of an embodiment of the present disclosure.

FIG. 23A is an example diagram for downlink beam failure scenario in atransmission receiving point (TRP) as per an aspect of an embodiment ofthe present disclosure.

FIG. 23B is an example diagram for downlink beam failure scenario inmultiple TRPs as per an aspect of an embodiment of the presentdisclosure.

FIG. 24A is an example diagram for a secondary activation/deactivationmedium access control control element (MAC CE) as per an aspect of anembodiment of the present disclosure.

FIG. 24B is an example diagram for a secondary activation/deactivationMAC CE as per an aspect of an embodiment of the present disclosure.

FIG. 25A is an example diagram for timing for CSI report when activationof a secondary cell as per an aspect of an embodiment of the presentdisclosure.

FIG. 25B is an example diagram for timing for CSI report when activationof a secondary cell as per an aspect of an embodiment of the presentdisclosure.

FIG. 26 is an example diagram for downlink control information (DCI)formats as per an aspect of an embodiment of the present disclosure.

FIG. 27 is an example diagram for bandwidth part (BWP) configurations asper an aspect of an embodiment of the present disclosure.

FIG. 28 is an example diagram for BWP operation in a secondary cell asper an aspect of an embodiment of the present disclosure.

FIG. 29 is an example diagram for various CSI reporting mechanisms asper an aspect of an embodiment of the present disclosure.

FIG. 30 is an example diagram for semi-persistent CSI reportingmechanism as per an aspect of an embodiment of the present disclosure.

FIG. 31 is an example diagram for semi-persistent CSI reportingmechanism as per an aspect of an embodiment of the present disclosure.

FIG. 32 is an example diagram for semi-persistent CSI reportingmechanism as per an aspect of an embodiment of the present disclosure.

FIG. 33 is an example diagram for semi-persistent CSI reportingmechanism as per an aspect of an embodiment of the present disclosure.

FIG. 34 is an example diagram for semi-persistent CSI reporting andCSI-RS transmission mechanism as per an aspect of an embodiment of thepresent disclosure.

FIG. 35 is an example diagram for semi-persistent CSI reporting andCSI-RS transmission mechanism as per an aspect of an embodiment of thepresent disclosure.

FIG. 36 is an example diagram for semi-persistent CSI reportingmechanism as per an aspect of an embodiment of the present disclosure.

FIG. 37 is an example diagram for semi-persistent CSI reportingmechanism as per an aspect of an embodiment of the present disclosure.

FIG. 38 is an example diagram for semi-persistent CSI reportingmechanism when performing BWP switching as per an aspect of anembodiment of the present disclosure.

FIG. 39 is an example diagram for semi-persistent CSI reportingmechanism when performing BWP switching as per an aspect of anembodiment of the present disclosure.

FIG. 40 is an example diagram for semi-persistent CSI reportingmechanism when performing BWP switching as per an aspect of anembodiment of the present disclosure.

FIG. 41 is an example diagram for semi-persistent CSI reportingmechanism when performing BWP switching as per an aspect of anembodiment of the present disclosure.

FIG. 42 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 43 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 44 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 45 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 46 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 47 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 48 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 49 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 50 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 51 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 52 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 53 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

FIG. 54 is a flow diagram of an aspect of an embodiment of the presentdisclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Example embodiments of the present invention enable operation of carrieraggregation. Embodiments of the technology disclosed herein may beemployed in the technical field of multicarrier communication systems.More particularly, the embodiments of the technology disclosed hereinmay relate to signal transmission in a multicarrier communicationsystem.

The following Acronyms are used throughout the present disclosure:

ASIC application-specific integrated circuit

BPSK binary phase shift keying

CA carrier aggregation

CC component carrier

CDMA code division multiple access

CP cyclic prefix

CPLD complex programmable logic devices

CSI channel state information

CSS common search space

CU central unit

DC dual connectivity

DCI downlink control information

DL downlink

DU distributed unit

eMBB enhanced mobile broadband

EPC evolved packet core

E-UTRAN evolved-universal terrestrial radio access network

FDD frequency division multiplexing

FPGA field programmable gate arrays

Fs-C Fs-control plane

Fs-U Fs-user plane

gNB next generation node B

HDL hardware description languages

HARQ hybrid automatic repeat request

IE information element

LTE long term evolution

MAC media access control

MCG master cell group

MeNB master evolved node B

MIB master information block

MME mobility management entity

mMTC massive machine type communications

NAS non-access stratum

NGC next generation core

NG CP next generation control plane core

NG-C NG-control plane

NG-U NG-user plane

NR new radio

NR MAC new radio MAC

NR PHY new radio physical

NR PDCP new radio PDCP

NR RLC new radio RLC

NR RRC new radio RRC

NSSAI network slice selection assistance information

OFDM orthogonal frequency division multiplexing

PCC primary component carrier

PCell primary cell

PDCCH physical downlink control channel

PDCP packet data convergence protocol

PDU packet data unit

PHICH physical HARQ indicator channel

PHY physical

PLMN public land mobile network

PSCell primary secondary cell

pTAG primary timing advance group

PUCCH physical uplink control channel

PUSCH physical uplink shared channel

QAM quadrature amplitude modulation

QPSK quadrature phase shift keying

RA random access

RB resource blocks

RBG resource block groups

RLC radio link control

RRC radio resource control

SCC secondary component carrier

SCell secondary cell

SCG secondary cell group

SC-OFDM single carrier-OFDM

SDU service data unit

SeNB secondary evolved node B

SIB system information block

SFN system frame number

sTAGs secondary timing advance group

S-GW serving gateway

SRB signaling radio bearer

TA timing advance

TAG timing advance group

TAI tracking area identifier

TAT time alignment timer

TB transport block

TDD time division duplexing

TDMA time division multiple access

TTI transmission time interval

UE user equipment

UL uplink

UPGW user plane gateway

URLLC ultra-reliable low-latency communications

VHDL VHSIC hardware description language

Xn-C Xn-control plane

Xn-U Xn-user plane

Xx-C Xx-control plane

Xx-U Xx-user plane

Example embodiments of the invention may be implemented using variousphysical layer modulation and transmission mechanisms. Exampletransmission mechanisms may include, but are not limited to: CDMA, OFDM,TDMA, Wavelet technologies, and/or the like. Hybrid transmissionmechanisms such as TDMA/CDMA, and OFDM/CDMA may also be employed.Various modulation schemes may be applied for signal transmission in thephysical layer. Examples of modulation schemes include, but are notlimited to: phase, amplitude, code, a combination of these, and/or thelike. An example radio transmission method may implement QAM using BPSK,QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM and/or the like. Physical radiotransmission may be enhanced by dynamically or semi-dynamically changingthe modulation and coding scheme depending on transmission requirementsand radio conditions.

FIG. 1 is a diagram depicting example sets of OFDM subcarriers as per anaspect of an embodiment of the present disclosure. As illustrated inthis example, arrow(s) in the diagram may depict a subcarrier in amulticarrier OFDM system. The OFDM system may use technology such asOFDM technology, DFTS-OFDM, SC-OFDM technology, or the like. Forexample, arrow 101 shows a subcarrier transmitting information symbols.FIG. 1 is for illustration purposes, and a typical multicarrier OFDMsystem may include more subcarriers in a carrier. For example, thenumber of subcarriers in a carrier may be in the range of 10 to 10,000subcarriers. FIG. 1 shows two guard bands 106 and 107 in a transmissionband. As illustrated in FIG. 1, guard band 106 is between subcarriers103 and subcarriers 104. The example set of subcarriers A 102 includessubcarriers 103 and subcarriers 104. FIG. 1 also illustrates an exampleset of subcarriers B 105. As illustrated, there is no guard band betweenany two subcarriers in the example set of subcarriers B 105. Carriers ina multicarrier OFDM communication system may be contiguous carriers,non-contiguous carriers, or a combination of both contiguous andnon-contiguous carriers.

FIG. 2 is a diagram depicting an example transmission time and receptiontime for two carriers as per an aspect of an embodiment of the presentdisclosure. A multicarrier OFDM communication system may include one ormore carriers, for example, ranging from 1 to 10 carriers. Carrier A 204and carrier B 205 may have the same or different timing structures.Although FIG. 2 shows two synchronized carriers, carrier A 204 andcarrier B 205 may or may not be synchronized with each other. Differentradio frame structures may be supported for FDD and TDD duplexmechanisms. FIG. 2 shows an example FDD frame timing. Downlink anduplink transmissions may be organized into radio frames 201. In thisexample, radio frame duration is 10 msec. Other frame durations, forexample, in the range of 1 to 100 msec may also be supported. In thisexample, each 10 ms radio frame 201 may be divided into ten equallysized subframes 202. Other subframe durations such as including 0.5msec, 1 msec, 2 msec, and 5 msec may also be supported. Subframe(s) maycomprise of two or more slots (e.g. slots 206 and 207). For the exampleof FDD, 10 subframes may be available for downlink transmission and 10subframes may be available for uplink transmissions in each 10 msinterval. Uplink and downlink transmissions may be separated in thefrequency domain. A slot may be 7 or 14 OFDM symbols for the samesubcarrier spacing of up to 60 kHz with normal CP. A slot may be 14 OFDMsymbols for the same subcarrier spacing higher than 60 kHz with normalCP. A slot may contain all downlink, all uplink, or a downlink part andan uplink part and/or alike. Slot aggregation may be supported, e.g.,data transmission may be scheduled to span one or multiple slots. In anexample, a mini-slot may start at an OFDM symbol in a subframe. Amini-slot may have a duration of one or more OFDM symbols. Slot(s) mayinclude a plurality of OFDM symbols 203. The number of OFDM symbols 203in a slot 206 may depend on the cyclic prefix length and subcarrierspacing.

FIG. 3 is a diagram depicting OFDM radio resources as per an aspect ofan embodiment of the present disclosure. The resource grid structure intime 304 and frequency 305 is illustrated in FIG. 3. The quantity ofdownlink subcarriers or RBs may depend, at least in part, on thedownlink transmission bandwidth 306 configured in the cell. The smallestradio resource unit may be called a resource element (e.g. 301).Resource elements may be grouped into resource blocks (e.g. 302).Resource blocks may be grouped into larger radio resources calledResource Block Groups (RBG) (e.g. 303). The transmitted signal in slot206 may be described by one or several resource grids of a plurality ofsubcarriers and a plurality of OFDM symbols. Resource blocks may be usedto describe the mapping of certain physical channels to resourceelements. Other pre-defined groupings of physical resource elements maybe implemented in the system depending on the radio technology. Forexample, 24 subcarriers may be grouped as a radio block for a durationof 5 msec. In an illustrative example, a resource block may correspondto one slot in the time domain and 180 kHz in the frequency domain (for15 KHz subcarrier bandwidth and 12 subcarriers).

In an example embodiment, multiple numerologies may be supported. In anexample, a numerology may be derived by scaling a basic subcarrierspacing by an integer N. In an example, scalable numerology may allow atleast from 15 kHz to 480 kHz subcarrier spacing. The numerology with 15kHz and scaled numerology with different subcarrier spacing with thesame CP overhead may align at a symbol boundary every 1 ms in a NRcarrier.

FIG. 5A, FIG. 5B, FIG. 5C and FIG. 5D are example diagrams for uplinkand downlink signal transmission as per an aspect of an embodiment ofthe present disclosure. FIG. 5A shows an example uplink physicalchannel. The baseband signal representing the physical uplink sharedchannel may perform the following processes. These functions areillustrated as examples and it is anticipated that other mechanisms maybe implemented in various embodiments. The functions may comprisescrambling, modulation of scrambled bits to generate complex-valuedsymbols, mapping of the complex-valued modulation symbols onto one orseveral transmission layers, transform precoding to generatecomplex-valued symbols, precoding of the complex-valued symbols, mappingof precoded complex-valued symbols to resource elements, generation ofcomplex-valued time-domain DFTS-OFDM/SC-FDMA signal for an antenna port,and/or the like.

Example modulation and up-conversion to the carrier frequency of thecomplex-valued DFTS-OFDM/SC-FDMA baseband signal for an antenna portand/or the complex-valued PRACH baseband signal is shown in FIG. 5B.Filtering may be employed prior to transmission.

An example structure for Downlink Transmissions is shown in FIG. 5C. Thebaseband signal representing a downlink physical channel may perform thefollowing processes. These functions are illustrated as examples and itis anticipated that other mechanisms may be implemented in variousembodiments. The functions include scrambling of coded bits in codewordsto be transmitted on a physical channel; modulation of scrambled bits togenerate complex-valued modulation symbols; mapping of thecomplex-valued modulation symbols onto one or several transmissionlayers; precoding of the complex-valued modulation symbols on a layerfor transmission on the antenna ports; mapping of complex-valuedmodulation symbols for an antenna port to resource elements; generationof complex-valued time-domain OFDM signal for an antenna port, and/orthe like.

Example modulation and up-conversion to the carrier frequency of thecomplex-valued OFDM baseband signal for an antenna port is shown in FIG.5D. Filtering may be employed prior to transmission.

FIG. 4 is an example block diagram of a base station 401 and a wirelessdevice 406, as per an aspect of an embodiment of the present disclosure.A communication network 400 may include at least one base station 401and at least one wireless device 406. The base station 401 may includeat least one communication interface 402, at least one processor 403,and at least one set of program code instructions 405 stored innon-transitory memory 404 and executable by the at least one processor403. The wireless device 406 may include at least one communicationinterface 407, at least one processor 408, and at least one set ofprogram code instructions 410 stored in non-transitory memory 409 andexecutable by the at least one processor 408. Communication interface402 in base station 401 may be configured to engage in communicationwith communication interface 407 in wireless device 406 via acommunication path that includes at least one wireless link 411.Wireless link 411 may be a bi-directional link. Communication interface407 in wireless device 406 may also be configured to engage in acommunication with communication interface 402 in base station 401. Basestation 401 and wireless device 406 may be configured to send andreceive data over wireless link 411 using multiple frequency carriers.According to some of the various aspects of embodiments, transceiver(s)may be employed. A transceiver is a device that includes both atransmitter and receiver. Transceivers may be employed in devices suchas wireless devices, base stations, relay nodes, and/or the like.Example embodiments for radio technology implemented in communicationinterface 402, 407 and wireless link 411 are illustrated are FIG. 1,FIG. 2, FIG. 3, FIG. 5, and associated text.

An interface may be a hardware interface, a firmware interface, asoftware interface, and/or a combination thereof. The hardware interfacemay include connectors, wires, electronic devices such as drivers,amplifiers, and/or the like. A software interface may include codestored in a memory device to implement protocol(s), protocol layers,communication drivers, device drivers, combinations thereof, and/or thelike. A firmware interface may include a combination of embeddedhardware and code stored in and/or in communication with a memory deviceto implement connections, electronic device operations, protocol(s),protocol layers, communication drivers, device drivers, hardwareoperations, combinations thereof, and/or the like.

The term configured may relate to the capacity of a device whether thedevice is in an operational or non-operational state. Configured mayalso refer to specific settings in a device that effect the operationalcharacteristics of the device whether the device is in an operational ornon-operational state. In other words, the hardware, software, firmware,registers, memory values, and/or the like may be “configured” within adevice, whether the device is in an operational or nonoperational state,to provide the device with specific characteristics. Terms such as “acontrol message to cause in a device” may mean that a control messagehas parameters that may be used to configure specific characteristics inthe device, whether the device is in an operational or non-operationalstate.

According to some of the various aspects of embodiments, a 5G networkmay include a multitude of base stations, providing a user plane NRPDCP/NR RLC/NR MAC/NR PHY and control plane (NR RRC) protocolterminations towards the wireless device. The base station(s) may beinterconnected with other base station(s) (e.g. employing an Xninterface). The base stations may also be connected employing, forexample, an NG interface to an NGC. FIG. 10A and FIG. 10B are examplediagrams for interfaces between a 5G core network (e.g. NGC) and basestations (e.g. gNB and eLTE eNB) as per an aspect of an embodiment ofthe present disclosure. For example, the base stations may beinterconnected to the NGC control plane (e.g. NG CP) employing the NG-Cinterface and to the NGC user plane (e.g. UPGW) employing the NG-Uinterface. The NG interface may support a many-to-many relation between5G core networks and base stations.

A base station may include many sectors for example: 1, 2, 3, 4, or 6sectors. A base station may include many cells, for example, rangingfrom 1 to 50 cells or more. A cell may be categorized, for example, as aprimary cell or secondary cell. At RRC connectionestablishment/re-establishment/handover, one serving cell may providethe NAS (non-access stratum) mobility information (e.g. TAI), and at RRCconnection re-establishment/handover, one serving cell may provide thesecurity input. This cell may be referred to as the Primary Cell(PCell). In the downlink, the carrier corresponding to the PCell may bethe Downlink Primary Component Carrier (DL PCC), while in the uplink, itmay be the Uplink Primary Component Carrier (UL PCC). Depending onwireless device capabilities, Secondary Cells (SCells) may be configuredto form together with the PCell a set of serving cells. In the downlink,the carrier corresponding to an SCell may be a Downlink SecondaryComponent Carrier (DL SCC), while in the uplink, it may be an UplinkSecondary Component Carrier (UL SCC). An SCell may or may not have anuplink carrier.

A cell, comprising a downlink carrier and optionally an uplink carrier,may be assigned a physical cell ID and a cell index. A carrier (downlinkor uplink) may belong to only one cell. The cell ID or Cell index mayalso identify the downlink carrier or uplink carrier of the cell(depending on the context it is used). In the specification, cell ID maybe equally referred to a carrier ID, and cell index may be referred tocarrier index. In implementation, the physical cell ID or cell index maybe assigned to a cell. A cell ID may be determined using asynchronization signal transmitted on a downlink carrier. A cell indexmay be determined using RRC messages. For example, when thespecification refers to a first physical cell ID for a first downlinkcarrier, the specification may mean the first physical cell ID is for acell comprising the first downlink carrier. The same concept may applyto, for example, carrier activation. When the specification indicatesthat a first carrier is activated, the specification may equally meanthat the cell comprising the first carrier is activated.

Embodiments may be configured to operate as needed. The disclosedmechanism may be performed when certain criteria are met, for example,in a wireless device, a base station, a radio environment, a network, acombination of the above, and/or the like. Example criteria may bebased, at least in part, on for example, traffic load, initial systemset up, packet sizes, traffic characteristics, a combination of theabove, and/or the like. When the one or more criteria are met, variousexample embodiments may be applied. Therefore, it may be possible toimplement example embodiments that selectively implement disclosedprotocols.

A base station may communicate with a mix of wireless devices. Wirelessdevices may support multiple technologies, and/or multiple releases ofthe same technology. Wireless devices may have some specificcapability(ies) depending on its wireless device category and/orcapability(ies). A base station may comprise multiple sectors. When thisdisclosure refers to a base station communicating with a plurality ofwireless devices, this disclosure may refer to a subset of the totalwireless devices in a coverage area. This disclosure may refer to, forexample, a plurality of wireless devices of a given LTE or 5G releasewith a given capability and in a given sector of the base station. Theplurality of wireless devices in this disclosure may refer to a selectedplurality of wireless devices, and/or a subset of total wireless devicesin a coverage area which perform according to disclosed methods, and/orthe like. There may be a plurality of wireless devices in a coveragearea that may not comply with the disclosed methods, for example,because those wireless devices perform based on older releases of LTE or5G technology.

FIG. 6 and FIG. 7 are example diagrams for protocol structure with CAand multi-connectivity as per an aspect of an embodiment of the presentdisclosure. NR may support multi-connectivity operation whereby amultiple RX/TX UE in RRC_CONNECTED may be configured to utilize radioresources provided by multiple schedulers located in multiple gNBsconnected via a non-ideal or ideal backhaul over the Xn interface. gNBsinvolved in multi-connectivity for a certain UE may assume two differentroles: a gNB may either act as a master gNB or as a secondary gNB. Inmulti-connectivity, a UE may be connected to one master gNB and one ormore secondary gNBs. FIG. 7 illustrates one example structure for the UEside MAC entities when a Master Cell Group (MCG) and a Secondary CellGroup (SCG) are configured, and it may not restrict implementation.Media Broadcast Multicast Service (MBMS) reception is not shown in thisfigure for simplicity.

In multi-connectivity, the radio protocol architecture that a particularbearer uses may depend on how the bearer is setup. Three examples ofbearers, including, an MCG bearer, an SCG bearer and a split bearer asshown in FIG. 6. NR RRC may be located in master gNB and SRBs may beconfigured as a MCG bearer type and may use the radio resources of themaster gNB. Multi-connectivity may also be described as having at leastone bearer configured to use radio resources provided by the secondarygNB. Multi-connectivity may or may not be configured/implemented inexample embodiments of the disclosure.

In the case of multi-connectivity, the UE may be configured withmultiple NR MAC entities: one NR MAC entity for master gNB, and other NRMAC entities for secondary gNBs. In multi-connectivity, the configuredset of serving cells for a UE may comprise of two subsets: the MasterCell Group (MCG) containing the serving cells of the master gNB, and theSecondary Cell Groups (SCGs) containing the serving cells of thesecondary gNBs. For a SCG, one or more of the following may be applied:at least one cell in the SCG has a configured UL CC and one of them,named PSCell (or PCell of SCG, or sometimes called PCell), is configuredwith PUCCH resources; when the SCG is configured, there may be at leastone SCG bearer or one Split bearer; upon detection of a physical layerproblem or a random access problem on a PSCell, or the maximum number ofNR RLC retransmissions has been reached associated with the SCG, or upondetection of an access problem on a PSCell during a SCG addition or aSCG change: a RRC connection re-establishment procedure may not betriggered, UL transmissions towards cells of the SCG are stopped, amaster gNB may be informed by the UE of a SCG failure type, for splitbearer, the DL data transfer over the master gNB is maintained; the NRRLC AM bearer may be configured for the split bearer; like PCell, PSCellmay not be de-activated; PSCell may be changed with a SCG change (e.g.with security key change and a RACH procedure); and/or a direct bearertype change between a Split bearer and a SCG bearer or simultaneousconfiguration of a SCG and a Split bearer may or may not supported.

With respect to the interaction between a master gNB and secondary gNBsfor multi-connectivity, one or more of the following principles may beapplied: the master gNB may maintain the RRM measurement configurationof the UE and may, (e.g., based on received measurement reports ortraffic conditions or bearer types), decide to ask a secondary gNB toprovide additional resources (serving cells) for a UE; upon receiving arequest from the master gNB, a secondary gNB may create a container thatmay result in the configuration of additional serving cells for the UE(or decide that it has no resource available to do so); for UEcapability coordination, the master gNB may provide (part of) the ASconfiguration and the UE capabilities to the secondary gNB; the mastergNB and the secondary gNB may exchange information about a UEconfiguration by employing of NR RRC containers (inter-node messages)carried in Xn messages; the secondary gNB may initiate a reconfigurationof its existing serving cells (e.g., PUCCH towards the secondary gNB);the secondary gNB may decide which cell is the PSCell within the SCG;the master gNB may or may not change the content of the NR RRCconfiguration provided by the secondary gNB; in the case of a SCGaddition and a SCG SCell addition, the master gNB may provide the latestmeasurement results for the SCG cell(s); both a master gNB and secondarygNBs may know the SFN and subframe offset of each other by OAM, (e.g.,for the purpose of DRX alignment and identification of a measurementgap). In an example, when adding a new SCG SCell, dedicated NR RRCsignaling may be used for sending required system information of thecell as for CA, except for the SFN acquired from a MIB of the PSCell ofa SCG.

In an example, serving cells may be grouped in a TA group (TAG). Servingcells in one TAG may use the same timing reference. For a given TAG,user equipment (UE) may use at least one downlink carrier as a timingreference. For a given TAG, a UE may synchronize uplink subframe andframe transmission timing of uplink carriers belonging to the same TAG.In an example, serving cells having an uplink to which the same TAapplies may correspond to serving cells hosted by the same receiver. AUE supporting multiple TAs may support two or more TA groups. One TAgroup may contain the PCell and may be called a primary TAG (pTAG). In amultiple TAG configuration, at least one TA group may not contain thePCell and may be called a secondary TAG (sTAG). In an example, carrierswithin the same TA group may use the same TA value and/or the sametiming reference. When DC is configured, cells belonging to a cell group(MCG or SCG) may be grouped into multiple TAGs including a pTAG and oneor more sTAGs.

FIG. 8 shows example TAG configurations as per an aspect of anembodiment of the present disclosure. In Example 1, pTAG comprisesPCell, and an sTAG comprises SCell1. In Example 2, a pTAG comprises aPCell and SCell1, and an sTAG comprises SCell2 and SCell3. In Example 3,pTAG comprises PCell and SCell1, and an sTAG1 includes SCell2 andSCell3, and sTAG2 comprises SCell4. Up to four TAGs may be supported ina cell group (MCG or SCG) and other example TAG configurations may alsobe provided. In various examples in this disclosure, example mechanismsare described for a pTAG and an sTAG. Some of the example mechanisms maybe applied to configurations with multiple sTAGs.

In an example, an eNB may initiate an RA procedure via a PDCCH order foran activated SCell. This PDCCH order may be sent on a scheduling cell ofthis SCell. When cross carrier scheduling is configured for a cell, thescheduling cell may be different than the cell that is employed forpreamble transmission, and the PDCCH order may include an SCell index.At least a non-contention based RA procedure may be supported forSCell(s) assigned to sTAG(s).

FIG. 9 is an example message flow in a random access process in asecondary TAG as per an aspect of an embodiment of the presentdisclosure. An eNB transmits an activation command 900 to activate anSCell. A preamble 902 (Msg1) may be sent by a UE in response to a PDCCHorder 901 on an SCell belonging to an sTAG. In an example embodiment,preamble transmission for SCells may be controlled by the network usingPDCCH format 1A. Msg2 message 903 (RAR: random access response) inresponse to the preamble transmission on the SCell may be addressed toRA-RNTI in a PCell common search space (CSS). Uplink packets 904 may betransmitted on the SCell in which the preamble was transmitted.

According to some of the various aspects of embodiments, initial timingalignment may be achieved through a random access procedure. This mayinvolve a UE transmitting a random access preamble and an eNB respondingwith an initial TA command NTA (amount of timing advance) within arandom access response window. The start of the random access preamblemay be aligned with the start of a corresponding uplink subframe at theUE assuming NTA=0. The eNB may estimate the uplink timing from therandom access preamble transmitted by the UE. The TA command may bederived by the eNB based on the estimation of the difference between thedesired UL timing and the actual UL timing. The UE may determine theinitial uplink transmission timing relative to the correspondingdownlink of the sTAG on which the preamble is transmitted.

The mapping of a serving cell to a TAG may be configured by a servingeNB with RRC signaling. The mechanism for TAG configuration andreconfiguration may be based on RRC signaling. According to some of thevarious aspects of embodiments, when an eNB performs an SCell additionconfiguration, the related TAG configuration may be configured for theSCell. In an example embodiment, an eNB may modify the TAG configurationof an SCell by removing (releasing) the SCell and adding (configuring) anew SCell (with the same physical cell ID and frequency) with an updatedTAG ID. The new SCell with the updated TAG ID may initially be inactivesubsequent to being assigned the updated TAG ID. The eNB may activatethe updated new SCell and start scheduling packets on the activatedSCell. In an example implementation, it may not be possible to changethe TAG associated with an SCell, but rather, the SCell may need to beremoved and a new SCell may need to be added with another TAG. Forexample, if there is a need to move an SCell from an sTAG to a pTAG, atleast one RRC message, for example, at least one RRC reconfigurationmessage, may be send to the UE to reconfigure TAG configurations byreleasing the SCell and then configuring the SCell as a part of the pTAG(when an SCell is added/configured without a TAG index, the SCell may beexplicitly assigned to the pTAG). The PCell may not change its TA groupand may be a member of the pTAG.

The purpose of an RRC connection reconfiguration procedure may be tomodify an RRC connection, (e.g. to establish, modify and/or release RBs,to perform handover, to setup, modify, and/or release measurements, toadd, modify, and/or release SCells). If the received RRC ConnectionReconfiguration message includes the sCellToReleaseList, the UE mayperform an SCell release. If the received RRC Connection Reconfigurationmessage includes the sCellToAddModList, the UE may perform SCelladditions or modification.

In LTE Release-10 and Release-11 CA, a PUCCH is only transmitted on thePCell (PSCell) to an eNB. In LTE-Release 12 and earlier, a UE maytransmit PUCCH information on one cell (PCell or PSCell) to a given eNB.

As the number of CA capable UEs and also the number of aggregatedcarriers increase, the number of PUCCHs and also the PUCCH payload sizemay increase. Accommodating the PUCCH transmissions on the PCell maylead to a high PUCCH load on the PCell. A PUCCH on an SCell may beintroduced to offload the PUCCH resource from the PCell. More than onePUCCH may be configured for example, a PUCCH on a PCell and anotherPUCCH on an SCell. In the example embodiments, one, two or more cellsmay be configured with PUCCH resources for transmitting CSI/ACK/NACK toa base station. Cells may be grouped into multiple PUCCH groups, and oneor more cell within a group may be configured with a PUCCH. In anexample configuration, one SCell may belong to one PUCCH group. SCellswith a configured PUCCH transmitted to a base station may be called aPUCCH SCell, and a cell group with a common PUCCH resource transmittedto the same base station may be called a PUCCH group.

In an example embodiment, a MAC entity may have a configurable timertimeAlignmentTimer per TAG. The timeAlignmentTimer may be used tocontrol how long the MAC entity considers the Serving Cells belonging tothe associated TAG to be uplink time aligned. The MAC entity may, when aTiming Advance Command MAC control element is received, apply the TimingAdvance Command for the indicated TAG; start or restart thetimeAlignmentTimer associated with the indicated TAG. The MAC entitymay, when a Timing Advance Command is received in a Random AccessResponse message for a serving cell belonging to a TAG and/or if theRandom Access Preamble was not selected by the MAC entity, apply theTiming Advance Command for this TAG and start or restart thetimeAlignmentTimer associated with this TAG. Otherwise, if thetimeAlignmentTimer associated with this TAG is not running, the TimingAdvance Command for this TAG may be applied and the timeAlignmentTimerassociated with this TAG started. When the contention resolution isconsidered not successful, a timeAlignmentTimer associated with this TAGmay be stopped. Otherwise, the MAC entity may ignore the received TimingAdvance Command.

In example embodiments, a timer is running once it is started, until itis stopped or until it expires; otherwise it may not be running. A timercan be started if it is not running or restarted if it is running. Forexample, a timer may be started or restarted from its initial value.

Example embodiments of the disclosure may enable operation ofmulti-carrier communications. Other example embodiments may comprise anon-transitory tangible computer readable media comprising instructionsexecutable by one or more processors to cause operation of multi-carriercommunications. Yet other example embodiments may comprise an article ofmanufacture that comprises a non-transitory tangible computer readablemachine-accessible medium having instructions encoded thereon forenabling programmable hardware to cause a device (e.g. wirelesscommunicator, UE, base station, etc.) to enable operation ofmulti-carrier communications. The device may include processors, memory,interfaces, and/or the like. Other example embodiments may comprisecommunication networks comprising devices such as base stations,wireless devices (or user equipment: UE), servers, switches, antennas,and/or the like.

FIG. 11A, FIG. 11B, FIG. 11C, FIG. 11D, FIG. 11E, and FIG. 11F areexample diagrams for architectures of tight interworking between 5G RANand LTE RAN as per an aspect of an embodiment of the present disclosure.The tight interworking may enable a multiple RX/TX UE in RRC_CONNECTEDto be configured to utilize radio resources provided by two schedulerslocated in two base stations (e.g. (e)LTE eNB and gNB) connected via anon-ideal or ideal backhaul over the Xx interface between LTE eNB andgNB or the Xn interface between eLTE eNB and gNB. Base stations involvedin tight interworking for a certain UE may assume two different roles: abase station may either act as a master base station or as a secondarybase station. In tight interworking, a UE may be connected to one masterbase station and one secondary base station. Mechanisms implemented intight interworking may be extended to cover more than two base stations.

In FIG. 11A and FIG. 11B, a master base station may be an LTE eNB, whichmay be connected to EPC nodes (e.g. to an MME via the S1-C interface andto an S-GW via the S1-U interface), and a secondary base station may bea gNB, which may be a non-standalone node having a control planeconnection via an Xx-C interface to an LTE eNB. In the tightinterworking architecture of FIG. 11A, a user plane for a gNB may beconnected to an S-GW through an LTE eNB via an Xx-U interface betweenLTE eNB and gNB and an S1-U interface between LTE eNB and S-GW. In thearchitecture of FIG. 11B, a user plane for a gNB may be connecteddirectly to an S-GW via an S1-U interface between gNB and S-GW.

In FIG. 11C and FIG. 11D, a master base station may be a gNB, which maybe connected to NGC nodes (e.g. to a control plane core node via theNG-C interface and to a user plane core node via the NG-U interface),and a secondary base station may be an eLTE eNB, which may be anon-standalone node having a control plane connection via an Xn-Cinterface to a gNB. In the tight interworking architecture of FIG. 11C,a user plane for an eLTE eNB may be connected to a user plane core nodethrough a gNB via an Xn-U interface between eLTE eNB and gNB and an NG-Uinterface between gNB and user plane core node. In the architecture ofFIG. 11D, a user plane for an eLTE eNB may be connected directly to auser plane core node via an NG-U interface between eLTE eNB and userplane core node.

In FIG. 11E and FIG. 11F, a master base station may be an eLTE eNB,which may be connected to NGC nodes (e.g. to a control plane core nodevia the NG-C interface and to a user plane core node via the NG-Uinterface), and a secondary base station may be a gNB, which may be anon-standalone node having a control plane connection via an Xn-Cinterface to an eLTE eNB. In the tight interworking architecture of FIG.11E, a user plane for a gNB may be connected to a user plane core nodethrough an eLTE eNB via an Xn-U interface between eLTE eNB and gNB andan NG-U interface between eLTE eNB and user plane core node. In thearchitecture of FIG. 11F, a user plane for a gNB may be connecteddirectly to a user plane core node via an NG-U interface between gNB anduser plane core node.

FIG. 12A, FIG. 12B, and FIG. 12C are example diagrams for radio protocolstructures of tight interworking bearers as per an aspect of anembodiment of the present disclosure. In FIG. 12A, an LTE eNB may be amaster base station, and a gNB may be a secondary base station. In FIG.12B, a gNB may be a master base station, and an eLTE eNB may be asecondary base station. In FIG. 12C, an eLTE eNB may be a master basestation, and a gNB may be a secondary base station. In 5G network, theradio protocol architecture that a particular bearer uses may depend onhow the bearer is setup. Three example bearers including an MCG bearer,an SCG bearer, and a split bearer as shown in FIG. 12A, FIG. 12B, andFIG. 12C. NR RRC may be located in master base station, and SRBs may beconfigured as an MCG bearer type and may use the radio resources of themaster base station. Tight interworking may also be described as havingat least one bearer configured to use radio resources provided by thesecondary base station. Tight interworking may or may not beconfigured/implemented in example embodiments of the disclosure.

In the case of tight interworking, the UE may be configured with two MACentities: one MAC entity for master base station, and one MAC entity forsecondary base station. In tight interworking, the configured set ofserving cells for a UE may comprise of two subsets: the Master CellGroup (MCG) containing the serving cells of the master base station, andthe Secondary Cell Group (SCG) containing the serving cells of thesecondary base station. For a SCG, one or more of the following may beapplied: at least one cell in the SCG has a configured UL CC and one ofthem, named PSCell (or PCell of SCG, or sometimes called PCell), isconfigured with PUCCH resources; when the SCG is configured, there maybe at least one SCG bearer or one split bearer; upon detection of aphysical layer problem or a random access problem on a PSCell, or themaximum number of (NR) RLC retransmissions has been reached associatedwith the SCG, or upon detection of an access problem on a PSCell duringa SCG addition or a SCG change: a RRC connection re-establishmentprocedure may not be triggered, UL transmissions towards cells of theSCG are stopped, a master base station may be informed by the UE of aSCG failure type, for split bearer, the DL data transfer over the masterbase station is maintained; the RLC AM bearer may be configured for thesplit bearer; like PCell, PSCell may not be de-activated; PSCell may bechanged with a SCG change (e.g. with security key change and a RACHprocedure); and/or neither a direct bearer type change between a Splitbearer and a SCG bearer nor simultaneous configuration of a SCG and aSplit bearer are supported.

With respect to the interaction between a master base station and asecondary base station, one or more of the following principles may beapplied: the master base station may maintain the RRM measurementconfiguration of the UE and may, (e.g., based on received measurementreports, traffic conditions, or bearer types), decide to ask a secondarybase station to provide additional resources (serving cells) for a UE;upon receiving a request from the master base station, a secondary basestation may create a container that may result in the configuration ofadditional serving cells for the UE (or decide that it has no resourceavailable to do so); for UE capability coordination, the master basestation may provide (part of) the AS configuration and the UEcapabilities to the secondary base station; the master base station andthe secondary base station may exchange information about a UEconfiguration by employing of RRC containers (inter-node messages)carried in Xn or Xx messages; the secondary base station may initiate areconfiguration of its existing serving cells (e.g., PUCCH towards thesecondary base station); the secondary base station may decide whichcell is the PSCell within the SCG; the master base station may notchange the content of the RRC configuration provided by the secondarybase station; in the case of a SCG addition and a SCG SCell addition,the master base station may provide the latest measurement results forthe SCG cell(s); both a master base station and a secondary base stationmay know the SFN and subframe offset of each other by OAM, (e.g., forthe purpose of DRX alignment and identification of a measurement gap).In an example, when adding a new SCG SCell, dedicated RRC signaling maybe used for sending required system information of the cell as for CA,except for the SFN acquired from a MIB of the PSCell of a SCG.

FIG. 13A and FIG. 13B are example diagrams for gNB deployment scenariosas per an aspect of an embodiment of the present disclosure. In thenon-centralized deployment scenario in FIG. 13A, the full protocol stack(e.g. NR RRC, NR PDCP, NR RLC, NR MAC, and NR PHY) may be supported atone node. In the centralized deployment scenario in FIG. 13B, upperlayers of gNB may be located in a Central Unit (CU), and lower layers ofgNB may be located in Distributed Units (DU). The CU-DU interface (e.g.Fs interface) connecting CU and DU may be ideal or non-ideal. Fs-C mayprovide a control plane connection over Fs interface, and Fs-U mayprovide a user plane connection over Fs interface. In the centralizeddeployment, different functional split options between CU and DUs may bepossible by locating different protocol layers (RAN functions) in CU andDU. The functional split may support flexibility to move RAN functionsbetween CU and DU depending on service requirements and/or networkenvironments. The functional split option may change during operationafter Fs interface setup procedure, or may change only in Fs setupprocedure (i.e. static during operation after Fs setup procedure).

FIG. 14 is an example diagram for different functional split optionexamples of the centralized gNB deployment scenario as per an aspect ofan embodiment of the present disclosure. In the split option example 1,an NR RRC may be in CU, and NR PDCP, NR RLC, NR MAC, NR PHY, and RF maybe in DU. In the split option example 2, an NR RRC and NR PDCP may be inCU, and NR RLC, NR MAC, NR PHY, and RF may be in DU. In the split optionexample 3, an NR RRC, NR PDCP, and partial function of NR RLC may be inCU, and the other partial function of NR RLC, NR MAC, NR PHY, and RF maybe in DU. In the split option example 4, an NR RRC, NR PDCP, and NR RLCmay be in CU, and NR MAC, NR PHY, and RF may be in DU. In the splitoption example 5, an NR RRC, NR PDCP, NR RLC, and partial function of NRMAC may be in CU, and the other partial function of NR MAC, NR PHY, andRF may be in DU. In the split option example 6, an NR RRC, NR PDCP, NRRLC, and NR MAC may be in CU, and NR PHY and RF may be in DU. In thesplit option example 7, an NR RRC, NR PDCP, NR RLC, NR MAC, and partialfunction of NR PHY may be in CU, and the other partial function of NRPHY and RF may be in DU. In the split option example 8, an NR RRC, NRPDCP, NR RLC, NR MAC, and NR PHY may be in CU, and RF may be in DU.

The functional split may be configured per CU, per DU, per UE, perbearer, per slice, or with other granularities. In per CU split, a CUmay have a fixed split, and DUs may be configured to match the splitoption of CU. In per DU split, a DU may be configured with a differentsplit, and a CU may provide different split options for different DUs.In per UE split, a gNB (CU and DU) may provide different split optionsfor different UEs. In per bearer split, different split options may beutilized for different bearer types. In per slice splice, differentsplit options may be applied for different slices.

In an example embodiment, the new radio access network (new RAN) maysupport different network slices, which may allow differentiatedtreatment customized to support different service requirements with endto end scope. The new RAN may provide a differentiated handling oftraffic for different network slices that may be pre-configured, and mayallow a single RAN node to support multiple slices. The new RAN maysupport selection of a RAN part for a given network slice, by one ormore slice ID(s) or NSSAI(s) provided by a UE or a NGC (e.g. NG CP). Theslice ID(s) or NSSAI(s) may identify one or more of pre-configurednetwork slices in a PLMN. For initial attach, a UE may provide a sliceID and/or an NSSAI, and a RAN node (e.g. gNB) may use the slice ID orthe NSSAI for routing an initial NAS signaling to an NGC control planefunction (e.g. NG CP). If a UE does not provide any slice ID or NSSAI, aRAN node may send a NAS signaling to a default NGC control planefunction. For subsequent accesses, the UE may provide a temporary ID fora slice identification, which may be assigned by the NGC control planefunction, to enable a RAN node to route the NAS message to a relevantNGC control plane function. The new RAN may support resource isolationbetween slices. The RAN resource isolation may be achieved by avoidingthat shortage of shared resources in one slice breaks a service levelagreement for another slice.

The amount of data traffic carried over cellular networks is expected toincrease for many years to come. The number of users/devices isincreasing and each user/device accesses an increasing number andvariety of services, e.g. video delivery, large files, images. Thisrequires not only high capacity in the network, but also provisioningvery high data rates to meet customers' expectations on interactivityand responsiveness. More spectrum is therefore needed for cellularoperators to meet the increasing demand. Considering user expectationsof high data rates along with seamless mobility, it is beneficial thatmore spectrum be made available for deploying macro cells as well assmall cells for cellular systems.

Striving to meet the market demands, there has been increasing interestfrom operators in deploying some complementary access utilizingunlicensed spectrum to meet the traffic growth. This is exemplified bythe large number of operator-deployed Wi-Fi networks and the 3GPPstandardization of LTE/WLAN interworking solutions. This interestindicates that unlicensed spectrum, when present, may be an effectivecomplement to licensed spectrum for cellular operators to helpaddressing the traffic explosion in some scenarios, such as hotspotareas. LAA offers an alternative for operators to make use of unlicensedspectrum while managing one radio network, thus offering newpossibilities for optimizing the network's efficiency.

In an example embodiment, Listen-before-talk (clear channel assessment)may be implemented for transmission in an LAA cell. In alisten-before-talk (LBT) procedure, equipment may apply a clear channelassessment (CCA) check before using the channel. For example, the CCAutilizes at least energy detection to determine the presence or absenceof other signals on a channel in order to determine if a channel isoccupied or clear, respectively. For example, European and Japaneseregulations mandate the usage of LBT in the unlicensed bands. Apart fromregulatory requirements, carrier sensing via LBT may be one way for fairsharing of the unlicensed spectrum.

In an example embodiment, discontinuous transmission on an unlicensedcarrier with limited maximum transmission duration may be enabled. Someof these functions may be supported by one or more signals to betransmitted from the beginning of a discontinuous LAA downlinktransmission. Channel reservation may be enabled by the transmission ofsignals, by an LAA node, after gaining channel access via a successfulLBT operation, so that other nodes that receive the transmitted signalwith energy above a certain threshold sense the channel to be occupied.Functions that may need to be supported by one or more signals for LAAoperation with discontinuous downlink transmission may include one ormore of the following: detection of the LAA downlink transmission(including cell identification) by wireless devices; time & frequencysynchronization of wireless devices.

In an example embodiment, DL LAA design may employ subframe boundaryalignment according to LTE-A carrier aggregation timing relationshipsacross serving cells aggregated by CA. This may not imply that the basestation transmissions may start only at the subframe boundary. LAA maysupport transmitting PDSCH when not all OFDM symbols are available fortransmission in a subframe according to LBT. Delivery of necessarycontrol information for the PDSCH may also be supported.

LBT procedure may be employed for fair and friendly coexistence of LAAwith other operators and technologies operating in unlicensed spectrum.LBT procedures on a node attempting to transmit on a carrier inunlicensed spectrum require the node to perform a clear channelassessment to determine if the channel is free for use. An LBT proceduremay involve at least energy detection to determine if the channel isbeing used. For example, regulatory requirements in some regions, e.g.,in Europe, specify an energy detection threshold such that if a nodereceives energy greater than this threshold, the node assumes that thechannel is not free. While nodes may follow such regulatoryrequirements, a node may optionally use a lower threshold for energydetection than that specified by regulatory requirements. In an example,LAA may employ a mechanism to adaptively change the energy detectionthreshold, e.g., LAA may employ a mechanism to adaptively lower theenergy detection threshold from an upper bound. Adaptation mechanism maynot preclude static or semi-static setting of the threshold. In anexample Category 4 LBT mechanism or other type of LBT mechanisms may beimplemented.

Various example LBT mechanisms may be implemented. In an example, forsome signals, in some implementation scenarios, in some situations,and/or in some frequencies no LBT procedure may performed by thetransmitting entity. In an example, Category 2 (e.g. LBT without randomback-off) may be implemented. The duration of time that the channel issensed to be idle before the transmitting entity transmits may bedeterministic. In an example, Category 3 (e.g. LBT with random back-offwith a contention window of fixed size) may be implemented. The LBTprocedure may have the following procedure as one of its components. Thetransmitting entity may draw a random number N within a contentionwindow. The size of the contention window may be specified by theminimum and maximum value of N. The size of the contention window may befixed. The random number N may be employed in the LBT procedure todetermine the duration of time that the channel is sensed to be idlebefore the transmitting entity transmits on the channel. In an example,Category 4 (e.g. LBT with random back-off with a contention window ofvariable size) may be implemented. The transmitting entity may draw arandom number N within a contention window. The size of contentionwindow may be specified by the minimum and maximum value of N. Thetransmitting entity may vary the size of the contention window whendrawing the random number N. The random number N is used in the LBTprocedure to determine the duration of time that the channel is sensedto be idle before the transmitting entity transmits on the channel.

LAA may employ uplink LBT at the wireless device. The UL LBT scheme maybe different from the DL LBT scheme (e.g. by using different LBTmechanisms or parameters) for example, since the LAA UL is based onscheduled access which affects a wireless device's channel contentionopportunities. Other considerations motivating a different UL LBT schemeinclude, but are not limited to, multiplexing of multiple wirelessdevices in a single subframe.

In an example, a DL transmission burst may be a continuous transmissionfrom a DL transmitting node with no transmission immediately before orafter from the same node on the same CC. An UL transmission burst from awireless device perspective may be a continuous transmission from awireless device with no transmission immediately before or after fromthe same wireless device on the same CC. In an example, UL transmissionburst is defined from a wireless device perspective. In an example, anUL transmission burst may be defined from a base station perspective. Inan example, in case of a base station operating DL+UL LAA over the sameunlicensed carrier, DL transmission burst(s) and UL transmissionburst(s) on LAA may be scheduled in a TDM manner over the sameunlicensed carrier. For example, an instant in time may be part of a DLtransmission burst or an UL transmission burst.

A New Radio (NR) system may support both single beam and multi-beamoperations. In a multi-beam system, a base station (e.g., gNB) mayperform a downlink beam sweeping to provide coverage for downlinkSynchronization Signals (SSs) and common control channels. A UserEquipment (UE) may perform an uplink beam sweeping for uplink directionto access a cell. In a single beam scenario, a gNB may configuretime-repetition transmission for one SS block, which may comprise atleast Primary Synchronization Signal (PSS), Secondary SynchronizationSignal (SSS), and Physical Broadcast Channel (PBCH), with a wide beam.In a multi-beam scenario, a gNB may configure at least some of thesesignals and physical channels in multiple beams. A UE may identify atleast OFDM symbol index, slot index in a radio frame and radio framenumber from an SS block.

In an example, in an RRC_INACTIVE state or RRC_IDLE state, a UE mayassume that SS blocks form an SS burst, and an SS burst set. An SS burstset may have a given periodicity. In multi-beam scenarios, SS blocks maybe transmitted in multiple beams, together forming an SS burst. One ormore SS blocks may be transmitted on one beam. A beam has a steeringdirection. If multiple SS bursts are transmitted with beams, these SSbursts together may form an SS burst set as shown in FIG. 15. A basestation 1501 (e.g., a gNB in NR) may transmit SS bursts 1502A to 1502Hduring time periods 1503. A plurality of these SS bursts may comprise anSS burst set, such as an SS burst set 1504 (e.g., SS bursts 1502A and1502E). An SS burst set may comprise any number of a plurality of SSbursts 1502A to 1502H. Each SS burst within an SS burst set maytransmitted at a fixed or variable periodicity during time periods 1503.

An SS may be based on Cyclic Prefix-Orthogonal Frequency DivisionMultiplexing (CP-OFDM). The SS may comprise at least two types ofsynchronization signals; NR-PSS (Primary synchronization signal) andNR-SSS (Secondary synchronization signal). NR-PSS may be defined atleast for initial symbol boundary synchronization to the NR cell. NR-SSSmay be defined for detection of NR cell ID or at least part of NR cellID. NR-SSS detection may be based on the fixed time/frequencyrelationship with NR-PSS resource position irrespective of duplex modeand beam operation type at least within a given frequency range and CPoverhead. Normal CP may be supported for NR-PSS and NR-SSS.

The NR may comprise at least one physical broadcast channel (NR-PBCH).When a gNB transmit (or broadcast) the NR-PBCH, a UE may decode theNR-PBCH based on the fixed relationship with NR-PSS and/or NR-SSSresource position irrespective of duplex mode and beam operation type atleast within a given frequency range and CP overhead. NR-PBCH may be anon-scheduled broadcast channel carrying at least a part of minimumsystem information with fixed payload size and periodicity predefined inthe specification depending on carrier frequency range.

In single beam and multi-beam scenarios, NR may comprise an SS blockthat may support time (frequency, and/or spatial) division multiplexingof NR-PSS, NR-SSS, and NR-PBCH. A gNB may transmit NR-PSS, NR-SSS and/orNR-PBCH within an SS block. For a given frequency band, an SS block maycorrespond to N OFDM symbols based on the default subcarrier spacing,and N may be a constant. The signal multiplexing structure may be fixedin NR. A wireless device may identify, e.g., from an SS block, an OFDMsymbol index, a slot index in a radio frame, and a radio frame numberfrom an SS block.

A NR may support an SS burst comprising one or more SS blocks. An SSburst set may comprise one or more SS bursts. For example, a number ofSS bursts within a SS burst set may be finite. From physical layerspecification perspective, NR may support at least one periodicity of SSburst set. From UE perspective, SS burst set transmission may beperiodic, and UE may assume that a given SS block is repeated with an SSburst set periodicity.

Within an SS burst set periodicity, NR-PBCH repeated in one or more SSblocks may change. A set of possible SS block time locations may bespecified per frequency band in an RRC message. The maximum number ofSS-blocks within SS burst set may be carrier frequency dependent. Theposition(s) of actual transmitted SS-blocks may be informed at least forhelping CONNECTED/IDLE mode measurement, for helping CONNECTED mode UEto receive downlink (DL) data/control in one or more SS-blocks, or forhelping IDLE mode UE to receive DL data/control in one or moreSS-blocks. A UE may not assume that the gNB transmits the same number ofphysical beam(s). A UE may not assume the same physical beam(s) acrossdifferent SS-blocks within an SS burst set. For an initial cellselection, UE may assume default SS burst set periodicity which may bebroadcast via an RRC message and frequency band-dependent. At least formulti-beams operation case, the time index of SS-block may be indicatedto the UE.

For CONNECTED and IDLE mode UEs, NR may support network indication of SSburst set periodicity and information to derive measurementtiming/duration (e.g., time window for NR-SS detection). A gNB mayprovide (e.g., via broadcasting an RRC message) one SS burst setperiodicity information per frequency carrier to UE and information toderive measurement timing/duration if possible. In case that one SSburst set periodicity and one information regarding timing/duration areindicated, a UE may assume the periodicity and timing/duration for allcells on the same carrier. If a gNB does not provide indication of SSburst set periodicity and information to derive measurementtiming/duration, a UE may assume a predefined periodicity, e.g., 5 ms,as the SS burst set periodicity. NR may support set of SS burst setperiodicity values for adaptation and network indication.

For initial access, a UE may assume a signal corresponding to a specificsubcarrier spacing of NR-PSS/SSS in a given frequency band given by a NRspecification. For NR-PSS, a Zadoff-Chu (ZC) sequence may be employed asa sequence for NR-PSS. NR may define at least one basic sequence lengthfor a SS in case of sequence-based SS design. The number of antenna portof NR-PSS may be 1. For NR-PBCH transmission, NR may support a fixednumber of antenna port(s). A UE may not be required for a blinddetection of NR-PBCH transmission scheme or number of antenna ports. AUE may assume the same PBCH numerology as that of NR-SS. For the minimumsystem information delivery, NR-PBCH may comprise a part of minimumsystem information. NR-PBCH contents may comprise at least a part of theSFN (system frame number) or CRC. A gNB may transmit the remainingminimum system information in shared downlink channel via NR-PDSCH.

In a multi-beam example, one or more of PSS, SSS, or PBCH signals may berepeated for a cell, e.g., to support cell selection, cell reselection,and/or initial access procedures. For an SS burst, an associated PBCH ora physical downlink shared channel (PDSCH) scheduling system informationmay be broadcasted by a base station to multiple wireless devices. ThePDSCH may be indicated by a physical downlink control channel (PDCCH) ina common search space. The system information may comprise a physicalrandom access channel (PRACH) configuration for a beam. For a beam, abase station (e.g., a gNB in NR) may have a RACH configuration which mayinclude a PRACH preamble pool, time and/or frequency radio resources,and other power related parameters. A wireless device may use a PRACHpreamble from a RACH configuration to initiate a contention-based RACHprocedure or a contention-free RACH procedure. A wireless device mayperform a 4-step RACH procedure, which may be a contention-based RACHprocedure or a contention-free RACH procedure. The wireless device mayselect a beam associated with an SS block that may have the bestreceiving signal quality. The wireless device may successfully detect acell identifier associated with the cell and decode system informationwith a RACH configuration. The wireless device may use one PRACHpreamble and select one PRACH resource from RACH resources indicated bythe system information associated with the selected beam. A PRACHresource may comprise at least one of: a PRACH index indicating a PRACHpreamble, a PRACH format, a PRACH numerology, time and/or frequencyradio resource allocation, power setting of a PRACH transmission, and/orother radio resource parameters. For a contention-free RACH procedure,the PRACH preamble and resource may be indicated in a DCI or other highlayer signaling.

Example Random Access Procedure in a Single-Beam System

In an example, a UE may detect one or more PSS/SSS/PBCH for cellselection/reselection and/or initial access procedures. PBCH, or aPhysical Downlink Shared Channel (PDSCH), indicated by a PhysicalDownlink Control Channel (PDCCH) in common search space, scheduling asystem information, such as System Information Block type 2 (SIB2), maybe broadcasted to multiple UEs. In an example, SIB2 may carry one ormore Physical Random Access Channel (PRACH) configuration. In anexample, a gNB may have one or more Random Access Channel (RACH)configuration which may include PRACH preamble pool, time/frequencyradio resources, and other power related parameters. A UE may select aPRACH preamble from a RACH configuration to initiate a contention-basedRACH procedure, or a contention-free RACH procedure.

In an example, a UE may perform a 4-step RACH procedure, which may be acontention-based or contention-free RACH procedure. A four-step randomaccess (RA) procedure may comprise RA preamble (RAP) transmission in thefirst step, random access response (RAR) transmission in the secondstep, scheduled transmission of one or more transport blocks (TBs) inthe third step, and contention resolution in the fourth step as shown inFIG. 16. Specifically, FIG. 16A shows a contention-based 4-step RAprocedure, and FIG. 16B shows a contention-free RA procedure.

In the first step, a UE may transmit a RAP using a configured RApreamble format with a Tx beam. RA channel (RACH) resource may bedefined as a time-frequency resource to transmit a RAP. Broadcast systeminformation may inform whether a UE needs to transmit one ormultiple/repeated preamble within a subset of RACH resources.

A base station may configure an association between DL signal/channel,and a subset of RACH resources and/or a subset of RAP indices, fordetermining the downlink (DL) transmission in the second step. Based onthe DL measurement and the corresponding association, a UE may selectthe subset of RACH resources and/or the subset of RAP indices. In anexample, there may be two RAP groups informed by broadcast systeminformation and one may be optional. If a base station configures thetwo groups in the four-step RA procedure, a UE may determine which groupthe UE selects a RAP from, based on the pathloss and a size of themessage to be transmitted by the UE in the third step. A base stationmay use a group type to which a RAP belongs as an indication of themessage size in the third step and the radio conditions at a UE. A basestation may broadcast the RAP grouping information along with one ormore thresholds on system information.

In the second step of the four-step RA procedure, a base station maytransmit a RA response (RAR) to the UE in response to reception of a RAPthat the UE transmits. A UE may monitor the PDCCH carrying a DCI, todetect RAR transmitted on a PDSCH in a RA Response window. The DCI maybe CRC-scrambled by the RA-RNTI (Random Access-RadioNetwork TemporaryIdentifier). RA-RNTI may be used on the PDCCH when Random AccessResponse messages are transmitted. It may unambiguously identify whichtime-frequency resource is used by the MAC entity to transmit the RandomAccess preamble. The RA Response window may start at the subframe thatcontains the end of a RAP transmission plus three subframes. The RAResponse window may have a length indicated by ra-ResponseWindowSize. AUE may compute the RA-RNTI associated with the PRACH in which the UEtransmits a RAP as: RA-RNTI=1+t_id+10*f_id, where t_id is an index of afirst subframe of a specified PRACH (0≤t_id<10), and f_id is an index ofa specified PRACH within the subframe, in ascending order of frequencydomain (0≤f_id<6). In an example, different types of UEs, e.g. NB-IoT,BL-UE, or UE-EC may employ different formulas for RA-RNTI calculations.

A UE may stop monitoring for RAR(s) after decoding of a MAC packet dataunit (PDU) for RAR comprising a RAP identifier (RAPID) that matches theRAP transmitted by the UE. The MAC PDU may comprise one or more MAC RARsand a MAC header that may comprise a subheader having a backoffindicator (BI) and one or more subheader that comprises RAPIDs.

FIG. 17 illustrates an example of a MAC PDU comprising a MAC header andMAC RARs for a four-step RA procedure. If a RAR comprises a RAPIDcorresponding to a RAP that a UE transmits, the UE may process the data,such as a timing advance (TA) command, a UL grant, and a TemporaryC-RNTI (TC-RNTI), in the RAR.

FIG. 18A, FIG. 18B and FIG. 18C show contents of a MAC RAR.Specifically, FIG. 18A shows the contents of a MAC RAR of a normal UE,FIG. 18B shows the contents of a MAC RAR of a MTC UE, and FIG. 18C showsthe contents of MAC RAR of a NB-IOT UE.

In the third step of the four-step RA procedure, a UE may adjust UL timealignment by using the TA value corresponding to the TA command in thereceived RAR in the second step and may transmit the one or more TBs toa base station using the UL resources assigned in the UL grant in thereceived RAR. The TBs that a UE transmits in the third step may compriseRRC signaling, such as RRC connection request, RRC connectionRe-establishment request, or RRC connection resume request, and a UEidentity. The identity transmitted in the third step is used as part ofthe contention-resolution mechanism in the fourth step.

The fourth step in the four-step RA procedure may comprise a DL messagefor contention resolution. In an example, one or more UEs may performsimultaneous RA attempts selecting the same RAP in the first step andreceive the same RAR with the same TC-RNTI in the second step. Thecontention resolution in the fourth step may be to ensure that a UE doesnot incorrectly use another UE Identity. The contention resolutionmechanism may be based on either C-RNTI on PDCCH or UE ContentionResolution Identity on DL-SCH, depending on whether a UE has a C-RNTI ornot. If a UE has C-RNTI, upon detection of C-RNTI on the PDCCH, the UEmay determine the success of RA procedure. If a UE does not have C-RNTIpre-assigned, the UE may monitor DL-SCH associated with TC-RNTI that abase station transmits in a RAR of the second step and compare theidentity in the data transmitted by the base station on DL-SCH in thefourth step with the identity that the UE transmits in the third step.If the two identities are identical, the UE may determine the success ofRA procedure and promote the TC-RNTI to the C-RNTI.

The forth step in the four-step RA procedure may allow HARQretransmission. A UE may start mac-ContentionResolutionTimer when the UEtransmits one or more TBs to a base station in the third step and mayrestart mac-ContentionResolutionTimer at each HARQ retransmission. Whena UE receives data on the DL resources identified by C-RNTI or TC-RNTIin the fourth step, the UE may stop the mac-ContentionResolutionTimer.If the UE does not detect the contention resolution identity thatmatches to the identity transmitted by the UE in the third step, the UEmay determine the failure of RA procedure and discard the TC-RNTI. Ifmac-ContentionResolutionTimer expires, the UE may determine the failureof RA procedure and discard the TC-RNTI. If the contention resolution isfailed, a UE may flush the HARQ buffer used for transmission of the MACPDU and may restart the four-step RA procedure from the first step. TheUE may delay the subsequent RAP transmission by the backoff timerandomly selected according to a uniform distribution between 0 and thebackoff parameter value corresponding the BI in the MAC PDU for RAR.

In a four-step RA procedure, the usage of the first two steps may be toobtain UL time alignment for a UE and obtain an uplink grant. The thirdand fourth steps may be used to setup RRC connections, and/or resolvecontention from different UEs.

Example Random Access Procedure in a Multi-Beam System

FIG. 19 shows an example of a random access procedure (e.g., via a RACH)that may include sending, by a base station, one or more SS blocks. Awireless device 1920 (e.g., a UE) may transmit one or more preambles toa base station 1921 (e.g., a gNB in NR). Each preamble transmission bythe wireless device may be associated with a separate random accessprocedure, such as shown in FIG. 19. The random access procedure maybegin at step 1901 with a base station 1921 (e.g., a gNB in NR) sendinga first SS block to a wireless device 1921 (e.g., a UE). Any of the SSblocks may comprise one or more of a PSS, SSS, tertiary synchronizationsignal (TSS), or PBCH signal. The first SS block in step 1901 may beassociated with a first PRACH configuration. At step 1902, the basestation 1921 may send to the wireless device 1920 a second SS block thatmay be associated with a second PRACH configuration. At step 1903, thebase station 1921 may send to the wireless device 1920 a third SS blockthat may be associated with a third PRACH configuration. At step 1904,the base station 1921 may send to the wireless device 1920 a fourth SSblock that may be associated with a fourth PRACH configuration. Anynumber of SS blocks may be sent in the same manner in addition to, orreplacing, steps 1903 and 1904. An SS burst may comprise any number ofSS blocks. For example, SS burst 1910 comprises the three SS blocks sentduring steps 1902-1904.

The wireless device 1920 may send to the base station 1921 a preamble,at step 1905, e.g., after or in response to receiving one or more SSblocks or SS bursts. The preamble may comprise a PRACH preamble, and maybe referred to as RA Msg 1. The PRACH preamble may be transmitted instep 1905 according to or based on a PRACH configuration that may bereceived in an SS block (e.g., one of the SS blocks from steps1901-1904) that may be determined to be the best SS block beam. Thewireless device 1920 may determine a best SS block beam from among SSblocks it may receive prior to sending the PRACH preamble. The basestation 1921 may send a random access response (RAR), which may bereferred to as RA Msg2, at step 1906, e.g., after or in response toreceiving the PRACH preamble. The RAR may be transmitted in step 1906via a DL beam that corresponds to the SS block beam associated with thePRACH configuration. The base station 1921 may determine the best SSblock beam from among SS blocks it previously sent prior to receivingthe PRACH preamble. The base station 1621 may receive the PRACH preambleaccording to or based on the PRACH configuration associated with thebest SS block beam.

The wireless device 1920 may send to the base station 1921 anRRCConnectionRequest and/or RRCConnectionResumeRequest message, whichmay be referred to as RA Msg3, at step 1907, e.g., after or in responseto receiving the RAR. The base station 1921 may send to the wirelessdevice 1920 an RRCConnectionSetup and/or RRCConnectionResume message,which may be referred to as RA Msg4, at step 1908, e.g., after or inresponse to receiving the RRCConnectionRequest and/orRRCConnectionResumeRequest message. The wireless device 1920 may send tothe base station 1921 an RRCConnectionSetupComplete and/orRRCConnectionResumeComplete message, which may be referred to as RAMsg5, at step 1909, e.g., after or in response to receiving theRRCConnectionSetup and/or RRCConnectionResume. An RRC connection may beestablished between the wireless device 1920 and the base station 1921,and the random access procedure may end, e.g., after or in response toreceiving the RRCConnectionSetupComplete and/orRRCConnectionResumeComplete message.

Example of Channel State Information Reference Signal Transmission andReception

A best beam, including but not limited to a best SS block beam, may bedetermined based on a channel state information reference signal(CSI-RS). A wireless device may use a CSI-RS in a multi-beam system forestimating the beam quality of the links between the wireless device anda base station. For example, based on a measurement of a CSI-RS, awireless device may report CSI for downlink channel adaption. A CSIparameter may include a precoding matrix index (PMI), a channel qualityindex (CQI) value, and/or a rank indicator (RI). A wireless device mayreport a beam index based on a reference signal received power (RSRP)measurement on a CSI-RS. The wireless device may report the beam indexin a CSI resource indication (CRI) for downlink beam selection. A basestation may transmit a CSI-RS via a CSI-RS resource, such as via one ormore antenna ports, or via one or more time and/or frequency radioresources. A beam may be associated with a CSI-RS. A CSI-RS may comprisean indication of a beam direction. Each of a plurality of beams may beassociated with one of a plurality of CSI-RSs. A CSI-RS resource may beconfigured in a cell-specific way, e.g., via common RRC signaling.Additionally or alternatively, a CSI-RS resource may be configured in awireless device-specific way, e.g., via dedicated RRC signaling and/orlayer 1 and/or layer 2 (L1/L2) signaling. Multiple wireless devices inor served by a cell may measure a cell-specific CSI-RS resource. Adedicated subset of wireless devices in or served by a cell may measurea wireless device-specific CSI-RS resource. A base station may transmita CSI-RS resource periodically, using aperiodic transmission, or using amulti-shot or semi-persistent transmission. In a periodic transmission,a base station may transmit the configured CSI-RS resource using aconfigured periodicity in the time domain. In an aperiodic transmission,a base station may transmit the configured CSI-RS resource in adedicated time slot. In a multi-shot or semi-persistent transmission, abase station may transmit the configured CSI-RS resource in a configuredperiod. A base station may configure different CSI-RS resources indifferent terms for different purposes. Different terms may include,e.g., cell-specific, device-specific, periodic, aperiodic, multi-shot,or other terms. Different purposes may include, e.g., beam management,CQI reporting, or other purposes.

FIG. 20 shows an example of transmitting CSI-RSs periodically for abeam. A base station 2001 may transmit a beam in a predefined order inthe time domain, such as during time periods 2003. Beams used for aCSI-RS transmission, such as for CSI-RS 2004 in transmissions 2002Cand/or 2003E, may have a different beam width relative to a beam widthfor SS-blocks transmission, such as for SS blocks 2002A, 2002B, 2002D,and 2002F-2002H. Additionally or alternatively, a beam width of a beamused for a CSI-RS transmission may have the same value as a beam widthfor an SS block. Some or all of one or more CSI-RSs may be included inone or more beams. An SS block may occupy a number of OFDM symbols(e.g., 4), and a number of subcarriers (e.g., 240), carrying asynchronization sequence signal. The synchronization sequence signal mayidentify a cell.

FIG. 21 shows an example of a CSI-RS that may be mapped in time andfrequency domains. Each square shown in FIG. 21 may represent a resourceblock within a bandwidth of a cell. Each resource block may comprise anumber of subcarriers. A cell may have a bandwidth comprising a numberof resource blocks. A base station (e.g., a gNB in NR) may transmit oneor more Radio Resource Control (RRC) messages comprising CSI-RS resourceconfiguration parameters for one or more CSI-RS. One or more of thefollowing parameters may be configured by higher layer signaling foreach CSI-RS resource configuration: CSI-RS resource configurationidentity, number of CSI-RS ports, CSI-RS configuration (e.g., symbol andRE locations in a subframe), CSI-RSsubframe configuration (e.g.,subframe location, offset, and periodicity in a radio frame), CSI-RSpower parameter, CSI-RSsequence parameter, CDM type parameter, frequencydensity, transmission comb, QCL parameters (e.g.,QCL-scramblingidentity, crs-portscount, mbsfn-subframeconfiglist,csi-rs-configZPid, qcl-csi-rs-configNZPid), and/or other radio resourceparameters.

FIG. 21 shows three beams that may be configured for a wireless device,e.g., in a wireless device-specific configuration. Any number ofadditional beams (e.g., represented by the column of blank squares) orfewer beams may be included. Beam 1 may be allocated with CSI-RS 1 thatmay be transmitted in some subcarriers in a resource block (RB) of afirst symbol. Beam 2 may be allocated with CSI-RS 2 that may betransmitted in some subcarriers in an RB of a second symbol. Beam 3 maybe allocated with CSI-RS 3 that may be transmitted in some subcarriersin a RB of a third symbol. All subcarriers in an RB may not necessarilybe used for transmitting a particular CSI-RS (e.g., CSI-RS 1) on anassociated beam (e.g., beam 1) for that CSI-RS. By using frequencydivision multiplexing (FDM), other subcarriers, not used for beam 1 forthe wireless device in the same RB, may be used for other CSI-RStransmissions associated with a different beam for other wirelessdevices. Additionally or alternatively, by using time domainmultiplexing (TDM), beams used for a wireless device may be configuredsuch that different beams (e.g., beam 1, beam 2, and beam 3) for thewireless device may be transmitted using some symbols different frombeams of other wireless devices.

Beam management may use a device-specific configured CSI-RS. In a beammanagement procedure, a wireless device may monitor a channel quality ofa beam pair link comprising a transmitting beam by a base station (e.g.,a gNB in NR) and a receiving beam by the wireless device (e.g., a UE).When multiple CSI-RSs associated with multiple beams are configured, awireless device may monitor multiple beam pair links between the basestation and the wireless device.

A wireless device may transmit one or more beam management reports to abase station. A beam management report may indicate one or more beampair quality parameters, comprising, e.g., one or more beamidentifications, RSRP, PMI, CQI, and/or RI, of a subset of configuredbeams.

A base station and/or a wireless device may perform a downlink L1/L2beam management procedure. One or more downlink L1/L2 beam managementprocedures may be performed within one or multiple transmission andreceiving points (TRPs), such as shown in FIG. 23A and FIG. 23B,respectively.

FIG. 22 shows examples of three beam management procedures, P1, P2, andP3. Procedure P1 may be used to enable a wireless device measurement ondifferent transmit (Tx) beams of a TRP (or multiple TRPs), e.g., tosupport a selection of Tx beams and/or wireless device receive (Rx)beam(s) (shown as ovals in the top row and bottom row, respectively, ofP1). Beamforming at a TRP (or multiple TRPs) may include, e.g., anintra-TRP and/or inter-TRP Tx beam sweep from a set of different beams(shown, in the top rows of P1 and P2, as ovals rotated in acounter-clockwise direction indicated by the dashed arrow). Beamformingat a wireless device 2201, may include, e.g., a wireless device Rx beamsweep from a set of different beams (shown, in the bottom rows of P1 andP3, as ovals rotated in a clockwise direction indicated by the dashedarrow). Procedure P2 may be used to enable a wireless device measurementon different Tx beams of a TRP (or multiple TRPs) (shown, in the top rowof P2, as ovals rotated in a counter-clockwise direction indicated bythe dashed arrow), e.g., which may change inter-TRP and/or intra-TRP Txbeam(s). Procedure P2 may be performed, e.g., on a smaller set of beamsfor beam refinement than in procedure P1. P2 may be a particular exampleof P1. Procedure P3 may be used to enable a wireless device measurementon the same Tx beam (shown as oval in P3), e.g., to change a wirelessdevice Rx beam if the wireless device 2201 uses beamforming.

A wireless device 2201 (e.g., a UE) and/or a base station 2202 (e.g., agNB) may trigger a beam failure recovery mechanism. The wireless device2201 may trigger a beam failure recovery (BFR) request transmission,e.g., if a beam failure event occurs. A beam failure event may include,e.g., a determination that a quality of beam pair link(s) of anassociated control channel is unsatisfactory. A determination of anunsatisfactory quality of beam pair link(s) of an associated channel maybe based on the quality falling below a threshold and/or an expirationof a timer.

The wireless device 2201 may measure a quality of beam pair link(s)using one or more reference signals (RS). One or more SS blocks, one ormore CSI-RS resources, and/or one or more demodulation reference signals(DM-RSs) of a PBCH may be used as a RS for measuring a quality of a beampair link. Each of the one or more CSI-RS resources may be associatedwith a CSI-RS resource index (CRI). A quality of a beam pair link may bebased on one or more of an RSRP value, reference signal received quality(RSRQ) value, and/or CSI value measured on RS resources. The basestation 2202 may indicate that an RS resource, e.g., that may be usedfor measuring a beam pair link quality, is quasi-co-located (QCLed) withone or more DM-RSs of a control channel. The RS resource and the DM-RSsof the control channel may be QCLed when the channel characteristicsfrom a transmission via an RS to the wireless device 2201, and thechannel characteristics from a transmission via a control channel to thewireless device, are similar or the same under a configured criterion.

FIG. 23A shows an example of a beam failure event involving a singleTRP. A single TRP such as at a base station 2301 may transmit, to awireless device 2302, a first beam 2303 and a second beam 2304. A beamfailure event may occur if, e.g., a serving beam, such as the secondbeam 2304, is blocked by a moving vehicle 2305 or other obstruction(e.g., building, tree, land, or any object) and configured beams (e.g.,the first beam 2303 and/or the second beam 2304), including the servingbeam, are received from the single TRP. The wireless device 2302 maytrigger a mechanism to recover from beam failure when a beam failureoccurs.

FIG. 23B shows an example of a beam failure event involving multipleTRPs. Multiple TRPs, such as at a first base station 2306 and at asecond base station 2309, may transmit, to a wireless device 2308, afirst beam 2307 (e.g., from the first base station 2306) and a secondbeam 2310 (e.g., from the second base station 2309). A beam failureevent may occur when, e.g., a serving beam, such as the second beam2310, is blocked by a moving vehicle 2311 or other obstruction (e.g.,building, tree, land, or any object) and configured beams (e.g., thefirst beam 2307 and/or the second beam 2310) are received from multipleTRPs. The wireless device 2008 may trigger a mechanism to recover frombeam failure when a beam failure occurs.

A wireless device may monitor a PDCCH, such as a New Radio PDCCH(NR-PDCCH), on M beam pair links simultaneously, where M≥1 and themaximum value of M may depend at least on the wireless devicecapability. Such monitoring may increase robustness against beam pairlink blocking. A base station may transmit, and the wireless device mayreceive, one or more messages configured to cause the wireless device tomonitor NR-PDCCH on different beam pair link(s) and/or in differentNR-PDCCH OFDM symbol.

A base station may transmit higher layer signaling, and/or a MAC controlelement (MAC CE), that may comprise parameters related to a wirelessdevice Rx beam setting for monitoring NR-PDCCH on multiple beam pairlinks. A base station may transmit one or more indications of a spatialQCL assumption between a first DL RS antenna port(s) and a second DL RSantenna port(s). The first DL RS antenna port(s) may be for one or moreof a cell-specific CSI-RS, device-specific CSI-RS, SS block, PBCH withDM-RSs of PBCH, and/or PBCH without DM-RSs of PBCH. The second DL RSantenna port(s) may be for demodulation of a DL control channel.Signaling for a beam indication for a NR-PDCCH (e.g., configuration tomonitor NR-PDCCH) may be via MAC CE signaling, RRC signaling, DCIsignaling, or specification-transparent and/or an implicit method, andany combination thereof.

For reception of unicast DL data channel, a base station may indicatespatial QCL parameters between DL RS antenna port(s) and DM-RS antennaport(s) of DL data channel. A base station may transmit DCI (e.g.,downlink grants) comprising information indicating the RS antennaport(s). The information may indicate the RS antenna port(s) which maybe QCLed with DM-RS antenna port(s). A different set of DM-RS antennaport(s) for the DL data channel may be indicated as a QCL with adifferent set of RS antenna port(s).

If a base station transmits a signal indicating a spatial QCL parametersbetween CSI-RS and DM-RS for PDCCH, a wireless device may use CSI-RSsQCLed with DM-RS for a PDCCH to monitor beam pair link quality. If abeam failure event occurs, the wireless device may transmit a beamfailure recovery request, such as by a determined configuration.

If a wireless device transmits a beam failure recovery request, e.g.,via an uplink physical channel or signal, a base station may detect thatthere is a beam failure event, for the wireless device, by monitoringthe uplink physical channel or signal. The base station may initiate abeam recovery mechanism to recover the beam pair link for transmittingPDCCH between the base station and the wireless device. The base stationmay transmit one or more control signals, to the wireless device, e.g.,after or in response to receiving the beam failure recovery request. Abeam recovery mechanism may be, e.g., an L1 scheme, or a higher layerscheme.

A base station may transmit one or more messages comprising, e.g.,configuration parameters of an uplink physical channel and/or a signalfor transmitting a beam failure recovery request. The uplink physicalchannel and/or signal may be based on at least one of the following: anon-contention based PRACH (e.g., a beam failure recovery PRACH orBFR-PRACH), which may use a resource orthogonal to resources of otherPRACH transmissions; a PUCCH (e.g., beam failure recovery PUCCH orBFR-PUCCH); and/or a contention-based PRACH resource. Combinations ofthese candidate signal and/or channels may be configured by a basestation.

A gNB may respond a confirmation message to a UE after receiving one ormultiple BFR request. The confirmation message may include the CRIassociated with the candidate beam the UE indicates in the one ormultiple BFR request. The confirmation message may be a L1 controlinformation.

Example Carrier Aggregation (CA) Operation

In carrier aggregation (CA), two or more component carriers (CCs) may beaggregated. A wireless device may simultaneously receive or transmit onone or more CCs, depending on capabilities of the wireless device, usingthe technique of CA. In an example, a wireless device may support CA forcontiguous CCs and/or for non-contiguous CCs. CCs may be organized intocells. For example, CCs may be organized into one primary cell (PCell)and one or more secondary cells (SCells).

When configured with CA, a wireless device may have one RRC connectionwith a network. During an RRC connectionestablishment/re-establishment/handover, a cell providing NAS mobilityinformation may be a serving cell. During an RRC connectionre-establishment/handover procedure, a cell providing a security inputmay be a serving cell. In an example, the serving cell may denote aPCell. In an example, a gNB may transmit, to a wireless device, one ormore messages comprising configuration parameters of a plurality of oneor more SCells, depending on capabilities of the wireless device.

When configured with CA, a base station and/or a wireless device mayemploy an activation/deactivation mechanism of an SCell to improvebattery or power consumption of the wireless device. When a wirelessdevice is configured with one or more SCells, a gNB may activate ordeactivate at least one of the one or more SCells. Upon configuration ofan SCell, the SCell may be deactivated unless an SCell state associatedwith the SCell is set to “activated” or “dormant”.

In an example, a wireless device may activate/deactivate an SCell inresponse to receiving an SCell Activation/Deactivation MAC CE.

In an example, a gNB may transmit, to a wireless device, one or moremessages comprising an SCell timer (e.g., sCellDeactivationTimer). In anexample, a wireless device may deactivate an SCell in response to anexpiry of the SCell timer.

When a wireless device receives an SCell Activation/Deactivation MAC CEactivating an SCell, the wireless device may activate the SCell. Inresponse to the activating the SCell, the wireless device may performoperations comprising: SRS transmissions on the SCell; CQI/PMI/RI/CRIreporting for the SCell; PDCCH monitoring on the SCell; PDCCH monitoringfor the SCell; and/or PUCCH transmissions on the SCell.

In an example, in response to the activating the SCell, the wirelessdevice may start or restart a first SCell timer (e.g.,sCellDeactivationTimer) associated with the SCell. The wireless devicemay start or restart the first SCell timer in the slot when the SCellActivation/Deactivation MAC CE activating the SCell has been received.In an example, in response to the activating the SCell, the wirelessdevice may (re-)initialize one or more suspended configured uplinkgrants of a configured grant Type 1 associated with the SCell accordingto a stored configuration. In an example, in response to the activatingthe SCell, the wireless device may trigger PHR.

When a wireless device receives an SCell Activation/Deactivation MAC CEdeactivating an activated SCell, the wireless device may deactivate theactivated SCell. In an example, when a first SCell timer (e.g.,sCellDeactivationTimer) associated with an activated SCell expires, thewireless device may deactivate the activated SCell. In response to thedeactivating the activated SCell, the wireless device may stop the firstSCell timer associated with the activated SCell. In an example, inresponse to the deactivating the activated SCell, the wireless devicemay clear one or more configured downlink assignments and/or one or moreconfigured uplink grants of a configured uplink grant Type 2 associatedwith the activated SCell. In an example, in response to the deactivatingthe activated SCell, the wireless device may: suspend one or moreconfigured uplink grants of a configured uplink grant Type 1 associatedwith the activated SCell; and/or flush HARQ buffers associated with theactivated SCell.

In an example, when an SCell is deactivated, a wireless device may notperform operations comprising: transmitting SRS on the SCell; reportingCQI/PMI/RI/CRI for the SCell; transmitting on UL-SCH on the SCell;transmitting on RACH on the SCell; monitoring at least one first PDCCHon the SCell; monitoring at least one second PDCCH for the SCell; and/ortransmitting a PUCCH on the SCell.

In an example, when at least one first PDCCH on an activated SCellindicates an uplink grant or a downlink assignment, a wireless devicemay restart a first SCell timer (e.g., sCellDeactivationTimer)associated with the activated SCell. In an example, when at least onesecond PDCCH on a serving cell (e.g. a PCell or an SCell configured withPUCCH, i.e. PUCCH SCell) scheduling the activated SCell indicates anuplink grant or a downlink assignment for the activated SCell, awireless device may restart the first SCell timer (e.g.,sCellDeactivationTimer) associated with the activated SCell.

In an example, when an SCell is deactivated, if there is an ongoingrandom access procedure on the SCell, a wireless device may abort theongoing random access procedure on the SCell.

FIG. 24A shows an example of an SCell Activation/Deactivation MAC CE ofone octet. A first MAC PDU subheader with a first LCID (e.g., ‘111010’)may identify the SCell Activation/Deactivation MAC CE of one octet. TheSCell Activation/Deactivation MAC CE of one octet may have a fixed size.The SCell Activation/Deactivation MAC CE of one octet may comprise asingle octet. The single octet may comprise a first number of C-fields(e.g. seven) and a second number of R-fields (e.g., one).

FIG. 24B shows an example of an SCell Activation/Deactivation MAC CE offour octets. A second MAC PDU subheader with a second LCID (e.g.,‘111001’) may identify the SCell Activation/Deactivation MAC CE of fouroctets. The SCell Activation/Deactivation MAC CE of four octets may havea fixed size. The SCell Activation/Deactivation MAC CE of four octetsmay comprise four octets. The four octets may comprise a third number ofC-fields (e.g., 31) and a fourth number of R-fields (e.g., 1).

In FIG. 24A and/or FIG. 24B, a C_(i) field may indicate anactivation/deactivation status of an SCell with an SCell index i if anSCell with SCell index i is configured. In an example, when the C_(i)field is set to one, an SCell with an SCell index i may be activated. Inan example, when the C_(i) field is set to zero, an SCell with an SCellindex i may be deactivated. In an example, if there is no SCellconfigured with SCell index i, the wireless device may ignore the C_(i)field. In FIG. 24A and FIG. 24B, an R field may indicate a reserved bit.The R field may be set to zero.

FIG. 25A and FIG. 25B show timeline when a UE receives a MAC activationcommand. When a UE receives a MAC activation command for a secondarycell in subframe n, the corresponding actions in the MAC layer shall beapplied no later than the minimum requirement defined in 3GPP TS 36.133or TS 38.133 and no earlier than subframe n+8, except for the following:the actions related to CSI reporting and the actions related to thesCellDeactivationTimer associated with the secondary cell, which shallbe applied in subframe n+8. When a UE receives a MAC deactivationcommand for a secondary cell or the sCellDeactivationTimer associatedwith the secondary cell expires in subframe n, the corresponding actionsin the MAC layer shall apply no later than the minimum requirementdefined in 3GPP TS 36.133 or TS 38.133, except for the actions relatedto CSI reporting which shall be applied in subframe n+8.

When a UE receives a MAC activation command for a secondary cell insubframe n, the actions related to CSI reporting and the actions relatedto the sCellDeactivationTimer associated with the secondary cell, areapplied in subframe n+8. When a UE receives a MAC deactivation commandfor a secondary cell or other deactivation conditions are met (e.g. thesCellDeactivationTimer associated with the secondary cell expires) insubframe n, the actions related to CSI reporting are applied in subframen+8. The UE starts reporting invalid or valid CSI for the Scell at the(n+8)^(th) subframe, and start or restart the sCellDeactivationTimerwhen receiving the MAC CE activating the SCell in the n^(th) subframe.For some UE having slow activation, it may report an invalid CSI(out-of-range CSI) at the (n+8)^(th) subframe, for some UE having aquick activation, it may report a valid CSI at the (n+8)^(th) subframe.

When a UE receives a MAC activation command for an SCell in subframe n,the UE starts reporting CQI/PMI/RI/PTI for the SCell at subframe n+8 andstarts or restarts the sCellDeactivationTimer associated with the SCellat subframe n+8. It is important to define the timing of these actionsfor both UE and eNB. For example, sCellDeactivationTimer is maintainedin both eNB and UE and it is important that both UE and eNB stop, startand/or restart this timer in the same TTI. Otherwise, thesCellDeactivationTimer in the UE may not be in-sync with thecorresponding sCellDeactivationTimer in the eNB. Also, eNB startsmonitoring and receiving CSI (CQI/PMI/RI/PTI) according to thepredefined timing in the same TTI and/or after UE starts transmittingthe CSI. If the CSI timings in UE and eNB are not coordinated based on acommon standard or air interface signaling the network operation mayresult in inefficient operations and/or errors.

Example Downlink Control Information (DCI) Transmission and Reception

FIG. 26 shows DCI formats for an example of 20 MHz FDD operation with 2Tx antennas at the base station and no carrier aggregation in an LTEsystem. In a NR system, the DCI formats may comprise at least one of:DCI format 0_0/0_1 indicating scheduling of PUSCH in a cell; DCI format1_0/1_1 indicating scheduling of PDSCH in a cell; DCI format 2_0notifying a group of UEs of slot format; DCI format 2_1 notifying agroup of UEs of PRB(s) and OFDM symbol(s) where a UE may assume notransmission is intended for the UE; DCI format 2_2 indicatingtransmission of TPC commands for PUCCH and PUSCH; and/or DCI format 2_3indicating transmission of a group of TPC commands for SRS transmissionby one or more UEs. In an example, a gNB may transmit a DCI via a PDCCHfor scheduling decision and power-control commends. More specifically,the DCI may comprise at least one of: downlink scheduling assignments,uplink scheduling grants, power-control commands. The downlinkscheduling assignments may comprise at least one of: PDSCH resourceindication, transport format, HARQ information, and control informationrelated to multiple antenna schemes, a command for power control of thePUCCH used for transmission of ACK/NACK in response to downlinkscheduling assignments. The uplink scheduling grants may comprise atleast one of: PUSCH resource indication, transport format, and HARQrelated information, a power control command of the PUSCH.

In an example, different types of control information may correspond todifferent DCI message sizes. For example, supporting spatialmultiplexing with noncontiguous allocation of RBs in the frequencydomain may require a larger scheduling message in comparison with anuplink grant allowing for frequency-contiguous allocation only. DCIs maybe categorized into different DCI formats, where a format corresponds toa certain message size and usage.

In an example, a UE may monitor one or more PDCCH to detect one or moreDCI with one or more DCI format. The one or more PDCCH may betransmitted in common search space or UE-specific search space. A UE maymonitor PDCCH with only a limited set of DCI format, to save powerconsumption. For example, a normal UE may not be required to detect aDCI with DCI format 6 which is used for an eMTC UE. The more DCI formatto be detected, the more power be consumed at the UE.

In an example, a UE may monitor one or more PDCCH candidates to detectone or more DCI with one or more DCI format. The one or more PDCCH maybe transmitted in common search space or UE-specific search space. A UEmay monitor PDCCH with only a limited set of DCI format, to save powerconsumption. For example, a normal UE may not be required to detect aDCI with DCI format 6 which is used for an eMTC UE. The more DCI formatto be detected, the more power be consumed at the UE.

In an example, the one or more PDCCH candidates that a UE monitors maybe defined in terms of PDCCH UE-specific search spaces. A PDCCHUE-specific search space at CCE aggregation level L∈{1, 2, 4, 8} may bedefined by a set of PDCCH candidates for CCE aggregation level L. In anexample, for a DCI format, a UE may be configured per serving cell byone or more higher layer parameters a number of PDCCH candidates per CCEaggregation level L.

In an example, in non-DRX mode operation, a UE may monitor one or morePDCCH candidate in control resource set q according to a periodicity ofW_(PDCCH,q) symbols that may be configured by one or more higher layerparameters for control resource set q.

In an example, if a UE is configured with higher layer parameter, e.g.,cif-InSchedulingCell, the carrier indicator field value may correspondto cif-InSchedulingCell.

In an example, for the serving cell on which a UE may monitor one ormore PDCCH candidate in a UE-specific search space, if the UE is notconfigured with a carrier indicator field, the UE may monitor the one ormore PDCCH candidates without carrier indicator field. In an example,for the serving cell on which a UE may monitor one or more PDCCHcandidates in a UE-specific search space, if a UE is configured with acarrier indicator field, the UE may monitor the one or more PDCCHcandidates with carrier indicator field.

In an example, a UE may not monitor one or more PDCCH candidates on asecondary cell if the UE is configured to monitor one or more PDCCHcandidates with carrier indicator field corresponding to that secondarycell in another serving cell. For example, for the serving cell on whichthe UE may monitor one or more PDCCH candidates, the UE may monitor theone or more PDCCH candidates at least for the same serving cell.

In an example, the information in the DCI formats used for downlinkscheduling can be organized into different groups, with the fieldpresent varying between the DCI formats, including at least one of:resource information, consisting of: carrier indicator (0 or 3 bits), RBallocation; HARQ process number; MCS, NDI, and RV (for the first TB);MCS, NDI and RV (for the second TB); MIMO related information; PDSCHresource-element mapping and QCI; Downlink assignment index (DAI); TPCfor PUCCH; SRS request (1 bit), triggering one-shot SRS transmission;ACK/NACK offset; DCI format 0/1A indication, used to differentiatebetween DCI format 1A and 0; and padding if necessary. The MIMO relatedinformation may comprise at least one of: PMI, precoding information,transport block swap flag, power offset between PDSCH and referencesignal, reference-signal scrambling sequence, number of layers, and/orantenna ports for the transmission.

In an example, the information in the DCI formats used for uplinkscheduling can be organized into different groups, with the fieldpresent varying between the DCI formats, including at least one of:resource information, consisting of: carrier indicator, resourceallocation type, RB allocation; MCS, NDI (for the first TB); MCS, NDI(for the second TB); phase rotation of the uplink DMRS; precodinginformation; CSI request, requesting an aperiodic CSI report; SRSrequest (2 bit), used to trigger aperiodic SRS transmission using one ofup to three preconfigured settings; uplink index/DAI; TPC for PUSCH; DCIformat 0/1A indication; and padding if necessary.

In an example, a gNB may perform CRC scrambling for a DCI, beforetransmitting the DCI via a PDCCH. The gNB may perform CRC scrambling bybit-wise addition (or Modulo-2 addition or exclusive OR (XOR) operation)of multiple bits of at least one wireless device identifier (e.g.,C-RNTI, CS-RNTI, TPC-CS-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, SP CSIC-RNTI, SRS-TPC-RNTI, INT-RNTI, SFI-RNTI, P-RNTI, SI-RNTI, RA-RNTI,and/or MCS-C-RNTI) with the CRC bits of the DCI. The wireless device maycheck the CRC bits of the DCI, when detecting the DCI. The wirelessdevice may receive the DCI when the CRC is scrambled by a sequence ofbits that is the same as the at least one wireless device identifier.

In a NR system, in order to support wide bandwidth operation, a gNB maytransmit one or more PDCCH in different control resource sets. A gNB maytransmit one or more RRC message comprising configuration parameters ofone or more control resource sets. At least one of the one or morecontrol resource sets may comprise at least one of: a first OFDM symbol;a number of consecutive OFDM symbols; a set of resource blocks; aCCE-to-REG mapping; and a REG bundle size, in case of interleavedCCE-to-REG mapping.

Example of Physical Uplink Control Channel (PUCCH) Transmission

In an example, a wireless device may transmit one or more uplink controlinformation (UCI) via one or more PUCCH resources to a base station. Theone or more UCI may comprise at least one of: HARQ-ACK information;scheduling request (SR); and/or CSI report. In an example, a PUCCHresource may be identified by at least: frequency location (e.g.,starting PRB); and/or a PUCCH format associated with initial cyclicshift of a base sequence and time domain location (e.g., starting symbolindex). In an example, a PUCCH format may be PUCCH format 0, PUCCHformat 1, PUCCH format 2, PUCCH format 3, or PUCCH format 4. A PUCCHformat 0 may have a length of 1 or 2 OFDM symbols and be less than orequal to 2 bits. A PUCCH format 1 may occupy a number between 4 and 14of OFDM symbols and be less than or equal to 2 bits. A PUCCH format 2may occupy 1 or 2 OFDM symbols and be greater than 2 bits. A PUCCHformat 3 may occupy a number between 4 and 14 of OFDM symbols and begreater than 2 bits. A PUCCH format 4 may occupy a number between 4 and14 of OFDM symbols and be greater than 2 bits. The PUCCH resource may beconfigured on a PCell, or a PUCCH secondary cell.

In an example, when configured with multiple uplink BWPs, a base stationmay transmit to a wireless device, one or more RRC messages comprisingconfiguration parameters of one or more PUCCH resource sets (e.g., atmost 4 sets) on an uplink BWP of the multiple uplink BWPs. Each PUCCHresource set may be configured with a PUCCH resource set index, a listof PUCCH resources with each PUCCH resource being identified by a PUCCHresource identifier (e.g., pucch-Resourceid), and/or a maximum number ofUCI information bits a wireless device may transmit using one of theplurality of PUCCH resources in the PUCCH resource set.

In an example, when configured with one or more PUCCH resource sets, awireless device may select one of the one or more PUCCH resource setsbased on a total bit length of UCI information bits (e.g., HARQ-ARQbits, SR, and/or CSI) the wireless device will transmit. In an example,when the total bit length of UCI information bits is less than or equalto 2, the wireless device may select a first PUCCH resource set with thePUCCH resource set index equal to “0”. In an example, when the total bitlength of UCI information bits is greater than 2 and less than or equalto a first configured value, the wireless device may select a secondPUCCH resource set with the PUCCH resource set index equal to “1”. In anexample, when the total bit length of UCI information bits is greaterthan the first configured value and less than or equal to a secondconfigured value, the wireless device may select a third PUCCH resourceset with the PUCCH resource set index equal to “2”. In an example, whenthe total bit length of UCI information bits is greater than the secondconfigured value and less than or equal to a third value (e.g., 1706),the wireless device may select a fourth PUCCH resource set with thePUCCH resource set index equal to “3”.

In an example, a wireless device may determine, based on a number ofuplink symbols of UCI transmission and a number of UCI bits, a PUCCHformat from a plurality of PUCCH formats comprising PUCCH format 0,PUCCH format 1, PUCCH format 2, PUCCH format 3 and/or PUCCH format 4. Inan example, the wireless device may transmit UCI in a PUCCH using PUCCHformat 0 if the transmission is over 1 symbol or 2 symbols and thenumber of HARQ-ACK information bits with positive or negative SR(HARQ-ACK/SR bits) is 1 or 2. In an example, the wireless device maytransmit UCI in a PUCCH using PUCCH format 1 if the transmission is over4 or more symbols and the number of HARQ-ACK/SR bits is 1 or 2. In anexample, the wireless device may transmit UCI in a PUCCH using PUCCHformat 2 if the transmission is over 1 symbol or 2 symbols and thenumber of UCI bits is more than 2. In an example, the wireless devicemay transmit UCI in a PUCCH using PUCCH format 3 if the transmission isover 4 or more symbols, the number of UCI bits is more than 2 and PUCCHresource does not include an orthogonal cover code. In an example, thewireless device may transmit UCI in a PUCCH using PUCCH format 4 if thetransmission is over 4 or more symbols, the number of UCI bits is morethan 2 and the PUCCH resource includes an orthogonal cover code.

In an example, in order to transmit HARQ-ACK information on a PUCCHresource, a wireless device may determine the PUCCH resource from aPUCCH resource set. The PUCCH resource set may be determined asmentioned above. The wireless device may determine the PUCCH resourcebased on a PUCCH resource indicator field in a DCI (e.g., with a DCIformat 1_0 or DCI for 1_1) received on a PDCCH. A 3-bit PUCCH resourceindicator field in the DCI may indicate one of eight PUCCH resources inthe PUCCH resource set. The wireless device may transmit the HARQ-ACKinformation in a PUCCH resource indicated by the 3-bit PUCCH resourceindicator field in the DCI.

In an example, the wireless device may transmit one or more UCI bits viaa PUCCH resource of an active uplink BWP of a PCell or a PUCCH secondarycell. Since at most one active uplink BWP in a cell is supported for awireless device, the PUCCH resource indicated in the DCI is naturally aPUCCH resource on the active uplink BWP of the cell.

Example of Bandwidth Part Management

FIG. 27 shows example of multiple BWPs configuration. A gNB may transmitone or more messages comprising configuration parameters of one or morebandwidth parts (BWP) of a cell. The cell may be a PCell or a SCell. Theone or more messages may comprise: RRC connection reconfigurationmessage (e.g., RRCReconfiguration); RRC connection reestablishmentmessage (e.g., RRCRestablishment); and/or RRC connection setup message(e.g., RRCSetup). The one or more BWPs may have different numerologies.A gNB may transmit one or more control information for cross-BWPscheduling to a UE. One BWP may overlap with another BWP in frequencydomain.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters of one or more DL and/or UL BWPs for a cell,with at least one BWP as the active DL or UL BWP, and zero or one BWP asthe default DL or UL BWP. For the PCell, the active DL BWP may be the DLBWP on which the UE may monitor one or more PDCCH, and/or receive PDSCH.The active UL BWP is the UL BWP on which the UE may transmit uplinksignal. For a secondary cell (SCell) if configured, the active DL BWPmay be the DL BWP on which the UE may monitor one or more PDCCH andreceive PDSCH when the SCell is activated by receiving a MACactivation/deactivation CE. The active UL BWP is the UL BWP on which theUE may transmit PUCCH (if configured) and/or PUSCH when the SCell isactivated by receiving a MAC activation/deactivation CE. Configurationof multiple BWPs may be used to save UE's power consumption. Whenconfigured with an active BWP and a default BWP, a UE may switch to thedefault BWP if there is no activity on the active BWP. For example, adefault BWP may be configured with narrow bandwidth, an active BWP maybe configured with wide bandwidth. If there is no signal transmitting orreceiving, the UE may switch the BWP to the default BWP, which mayreduce power consumption.

In an example, for each DL BWP or UL BWP in a set of DL BWPs or UL BWPs,respectively, the wireless device may be configured the followingparameters for the serving cell: a subcarrier spacing provided by ahigher layer parameter (e.g., subcarrierSpacing); a cyclic prefixprovided by a higher layer parameter (e.g., cyclicPrefix); a first PRBand a number of contiguous PRBs indicated by a higher layer parameter(e.g., locationAndBandwidth) that is interpreted as RIV, and the firstPRB is a PRB offset relative to the PRB indicated by higher layerparameters (e.g., offsetToCarrier and subcarrierSpacing); an index inthe set of DL BWPs or UL BWPs by respective a higher layer parameter(e.g., bwp-Id); a set of BWP-common and a set of BWP-dedicatedparameters by higher layer parameters (e.g., bwp-Common andbwp-Dedicated).

In an example, switching BWP may be triggered by a DCI or a timer. Whena UE receives a DCI indicating DL BWP switching from an active BWP to anew BWP, the UE may monitor PDCCH and/or receive PDSCH on the new BWP.When the UE receives a DCI indicating UL BWP switching from an activeBWP to a new BWP, the UE may transmit PUCCH (if configured) and/or PUSCHon the new BWP. A gNB may transmit one or more messages comprising a BWPinactivity timer to a UE. The UE starts the timer when it switches itsactive DL BWP to a DL BWP other than the default DL BWP. The UE mayrestart the timer to the initial value when it successfully decodes aDCI to schedule PDSCH(s) in its active DL BWP. The UE may switch itsactive DL BWP to the default DL BWP when the BWP timer expires.

In an example, a BWP may be configured with: a subcarrier spacing, acyclic prefix, a number of contiguous PRBs, an offset of the first PRBin the number of contiguous PRBs relative to the first PRB, or Q controlresource sets if the BWP is a DL BWP.

In an example, on a SCell, there may be no initial active BWP since theinitial access is performed on the Pcell. For example, the initiallyactivated DL BWP and/or UL BWP, when the Scell is activated, may beconfigured or reconfigured by RRC signaling. In an example, the defaultBWP of the SCell may also be configured or reconfigured by RRCsignaling.

In an example, gNB may configure UE-specific default DL BWP other thaninitial active BWP after RRC connection, e.g., for the purpose of loadbalancing. The default BWP may support other connected mode operations(besides operations supported by initial active BWP), e.g., fall backand/or connected mode paging. In this case, the default BWP may comprisecommon search space, e.g., at least a search space needed for monitoringa pre-emption indication.

In an example, a DL BWP other than the initial active DL BWP may beconfigured to a UE as the default DL BWP. The reconfiguring the defaultDL BWP may be due to load balancing and/or different numerologiesemployed for active DL BWP and initial active DL BWP.

In an example, for a paired spectrum, DL and UL BWPs may beindependently activated while, for an unpaired spectrum DL and UL BWPSare jointly activated. In case of bandwidth adaptation, where thebandwidth of the active downlink BWP may be changed, there may, in caseof an unpaired spectrum, be a joint activation of a new downlink BWP andnew uplink BWP. For example, a new DL/UL BWP pair where the bandwidth ofthe uplink BWPs may be the same (e.g., no change of uplink BWP).

In an example embodiment, making an association between DL BWP and ULBWP may allow that one activation/deactivation command may switch bothDL and UL BWPs at once. Otherwise, separate BWP switching commands maybe necessary.

In an example, PUCCH resources may be configured in a configured UL BWP,in a default UL BWP and/or in both. For instance, if the PUCCH resourcesare configured in the default UL BWP, UE may retune to the default ULBWP for transmitting an SR. for example, the PUCCH resources areconfigured per BWP or a BWP other than the default BWP, the UE maytransmit an SR in the current active BWP without retuning.

In an example, there may be at most one active DL BWP and at most oneactive UL BWP at a given time for a serving cell. A BWP of a cell may beconfigured with a specific numerology/TTI. In an example, a logicalchannel and/or logical channel group that triggers SR transmission whilethe wireless device operates in one active BWP, the corresponding SR mayremain triggered in response to BWP switching.

In an example, when a new BWP is activated, a configured downlinkassignment may be initialized (if not active) or re-initialized (ifalready active) using PDCCH. In an example, via one or more RRCmessages/signaling, a wireless device may be configured with at leastone UL BWP, at least one DL BWP, and one or more configured grants for acell. The one or more configured grants may be semi-persistentscheduling (SPS), Type 1 grant-free (GF) transmission/scheduling, and/orType 2 GF transmission/scheduling. In an example, one or more configuredgrants may be configured per UL BWP. For example, one or more radioresources associated with one or more configured grants may not bedefined/assigned/allocated across two or more UL BWPs.

In an example, an BWP may be in active during a period of time when aBWP inactivity timer is running. For example, a base station maytransmit a control message to a wireless device to configure a firsttimer value of an BWP inactivity timer. The first timer value maydetermine how long a BWP inactivity timer runs, e.g., a period of timethat a BWP inactivity timer runs. For example, the BWP inactivity timermay be implemented as a count-down timer from a first timer value downto a value (e.g., zero). In an example embodiment, the BWP inactivitytimer may be implemented as a count-up timer from a value (e.g., zero)up to a first timer value down. In an example embodiment, the BWPinactivity timer may be implemented as a down-counter from a first timervalue down to a value (e.g., zero). In an example embodiment, the BWPinactivity timer may be implemented as a count-up counter from a value(e.g., zero) up to a first timer value down. For example, a wirelessdevice may restart a BWP inactivity timer (e.g., UL BWP and/or DL BWPinactivity timers) when the wireless device receives (and/or decodes) aDCI to schedule PDSCH(s) in its active BWP (e.g., its active UL BWP, itsactive DL BWP, and/or UL/DL BWP pair).

FIG. 28 shows example of BWP switching mechanism. A UE may receive RRCmessage comprising parameters of a SCell and one or more BWPconfiguration associated with the SCell. Among the one or more BWPs, atleast one BWP may be configured as the first active BWP (e.g., BWP 1 inFIG. 28), one BWP as the default BWP (e.g., BWP 0 in FIG. 28). The UEmay receive a MAC CE to activate the SCell at the n^(th) slot. The UEmay start the sCellDeactivationTimer, and start CSI related actions forthe SCell, and/or start CSI related actions for the first active BWP ofthe SCell at the (n+x)^(th) slot. The UE may start the BWP inactivitytimer at the (n+x+k)^(th) slot in response to receiving a DCI indicatingswitching BWP from BWP 1 to BWP 2. When receiving a PDCCH indicating DLscheduling on BWP 2, for example, at the (n+x+k+m)^(th) slot, the UE mayrestart the BWP inactivity timer. The UE may switch back to the defaultBWP (e.g., BWP 0) as an active BWP when the BWP inactivity timerexpires, at the (n+x+k+m+1)^(th) slot. The UE may deactivate the SCellwhen the sCellDeactivationTimer expires.

In an example, a BWP inactivity timer may be applied in a PCell. A basestation may transmit one or more RRC messages comprising a BWPinactivity timer to a wireless device. The wireless device may start theBWP inactivity timer if the wireless devices switches its active DL BWPto a DL BWP other than the default DL BWP on the PCell. The wirelessdevice may restart the BWP inactivity timer if it successfully decodes aDCI to schedule PDSCH(s) in its active DL BWP. The wireless device mayswitch its active DL BWP to the default DL BWP if the BWP inactivitytimer expires.

In an example, employing the BWP inactivity timer may reduce UE's powerconsumption when the UE is configured with multiple BWPs on a cell (aPCell or a SCell). The UE may switch to a default BWP on the PCell orSCell when there is no activity on an active BWP (e.g., when the BWPinactivity timer expires).

Example of CSI Transmission Triggering on Multiple BWPs of a Cell

In an example, a gNB may transmit one or more RRC message comprising oneor more CSI configuration parameters comprising at least: one or moreCSI-RS resource settings; one or more CSI reporting settings, and oneCSI measurement setting.

In an example, a CSI-RS resource setting may comprise one or more CSI-RSresource sets. In an example, there may be one CSI-RS resource set forperiodic CSI-RS, or semi-persistent (SP) CSI-RS. In an example, a CSI-RSresource set may comprise at least one of: one CSI-RS type (e.g.,periodic, aperiodic, or semi-persistent); one or more CSI-RS resourcescomprising at least one of: CSI-RS resource configuration identity (orindex); number of CSI-RS ports; CSI-RS configuration (symbol and RElocations in a subframe); CSI-RSsubframe configuration (subframelocation, offset, and/or periodicity in radio frame); CSI-RS powerparameter; CSI-RSsequence parameter; CDM type parameter; frequencydensity; transmission comb; and/or QCL parameters.

In an example, one or more CSI-RS resources may be transmittedperiodically, using aperiodic transmission, using a multi-shottransmission, and/or using a SP transmission. In a periodictransmission, the configured CSI-RS resource may be transmitted using aconfigured periodicity in time domain. In an aperiodic transmission, theconfigured CSI-RS resource may be transmitted in a dedicated time slotor subframe. In a multi-shot or SP transmission, the configured CSI-RSresource may be transmitted within a configured period. In an example, agNB may transmit one or more SP CSI-RSs with a periodicity. The gNB maystop transmission of the one or more SP CSI-RSs if the CSI-RS isconfigured with a transmission duration. The gNB may stop transmissionof the one or SP CSI-RSs in response to transmitting a MAC CE or DCI fordeactivating (or stopping the transmission of) the one or more SPCSI-RSs.

In an example, a CSI reporting setting may comprise at least one of: onereport configuration identifier; one report type; one or more reportedCSI parameter(s); one or more CSI type (e.g., type I or type II); one ormore codebook configuration parameters; one or more parametersindicating time-domain behavior; frequency granularity for CQI and PMI;and/or measurement restriction configurations. The report type mayindicate a time domain behavior of the report (aperiodic, SP, orperiodic). The CSI reporting setting may further comprise at least oneof: one periodicity parameter; one duration parameter; and/or one offset(e.g., in unit of slots), if the report type is a periodic or SP report.The periodicity parameter may indicate a periodicity of a CSI report.The duration parameter may indicate a duration of CSI reporttransmission. The offset parameter may indicate value of timing offsetof CSI report.

In an example, a CSI measurement setting may comprise one or more linkscomprising one or more link parameters. The link parameter may compriseat least one of: one CSI reporting setting indication, CSI-RS resourcesetting indication, and one or more measurement parameters.

FIG. 29 shows example of various CSI report triggering mechanisms. In anexample, a gNB may trigger a CSI reporting by transmitting an RRCmessage, or a MAC CE, or a DCI, as shown in FIG. 29. In an example, a UEmay perform periodic CSI reporting (e.g., P-CSI reporting in FIG. 29)based on an RRC message and one or more periodic CSI-RSs. In an example,a UE may not be allowed (or required) to perform periodic CSI reportingbased on one or more aperiodic CSI-RSs and/or one or more SP CSI-RSs. Inan example, a UE may perform SP CSI reporting (e.g., SP-CSI reporting inFIG. 29) based on a MAC CE and/or a DCI and based on one or moreperiodic or SP CSI-RSs. In an example, a UE may not be allowed (orrequired) to perform SP CSI reporting based on one or more aperiodicCSI-RSs. In an example, a UE may perform aperiodic CSI reporting (e.g.,Ap-CSI reporting in FIG. 29) based on a DCI and based on one or moreperiodic, SP, or aperiodic CSI-RSs. In an example, a wireless device mayperform a SP CSI reporting on a PUCCH in response to the SP CSIreporting being activated (or triggered) by a MAC CE. The wirelessdevice may perform a SP CSI reporting on a PUSCH in response to the SPCSI reporting being activated (or triggered). In an example, a basestation may instruct (e.g., by transmitting the MAC CE) a wirelessdevice to perform SP CSI reporting on PUCCH when a compact CSI (e.g.,small amount of report contents) is required by the base station, or DCItransmission is not convenient for the base station, and/or the CSI isnot urgently required by the base station. In an example, a base stationmay instruct (e.g., by transmitting the DCI) a wireless device toperform SP CSI reporting on PUSCH when a large-sized CSI (e.g., bigamount of report contents) is required by the base station, or a DCItransmission is convenient for the base station, and/or the CSI isurgently required by the base station.

FIG. 30 shows an example of SP CSI reporting in a cell. In an example, abase station (e.g., gNB in FIG. 30) may transmit to a wireless device(e.g., UE in FIG. 30) one or more RRC messages comprising configurationparameters of one or more SP CSI reporting configurations. The basestation may transmit to the wireless device, at slot (or subframe) n, a1^(st) MAC CE or DCI indicating an activation of a SP CSI reportingconfiguration of the one or more SP CSI reporting configurations. Thebase station may start transmitting one or more SP CSI-RSs at slot (orsubframe) n+k. In an example, k may be zero or an integer greater thanzero, configured by an RRC message, or be predefined as a fixed value.

As shown in FIG. 30, after or in response to receiving the 1^(st) MAC CEor the 1^(st) DCI, the wireless device may perform CSI measurements onone or more CSI-RSs according to the activated SP CSI reportingconfiguration. In an example, after or in response to receiving the1^(st) MAC CE or the 1^(st) DCI, the wireless device may transmit one ormore SP CSI reports (e.g., based on the CSI measurements) atslot/subframe n+k+m, n+k+m+l, n+k+m+2*l, etc., with a periodicityof/subframes (or slots). The periodicity may be configured in an RRCmessage. In an example, the UE may receive a 2^(nd) MAC/DCI indicating adeactivation of the SP CSI reporting configuration. After receiving the2^(nd) MAC/DCI, or in response to the 2^(nd) MAC/DCI, the UE may stoptransmitting the one or more SP CSI reports. In an example, k may bezero (configured, or predefined). In an example, m (e.g., when k=0) maybe a time offset between the wireless device receives the 1^(st) MACCE/DCI for activation of the SP CSI reporting and the wireless devicetransmits a first SP CSI report of the one or more SP CSI reports. In anexample, m may be configured by an RRC message, or be predefined as afixed value. A value of m may depend on the capability of a UE and/orthe network.

As shown in FIG. 30, a wireless device may assume a CSI-RS transmissionperiod (e.g., CSI-RS transmission Window in FIG. 30), in response to a1^(st) MAC CE/DCI for activation of a SP CSI reporting configuration andbased on one or more configuration parameters of the activated SP CSIreporting configuration. The base station may transmit one or moreCSI-RSs at least in the CSI-RS transmission period, based on theactivated SP CSI reporting configuration. In an example, the wirelessdevice may perform CSI measurements on the one or more CSI-RSstransmitted in the CSI-RS transmission period.

FIG. 31 shows an example of SP CSI reporting in a cell. In an example, abase station (e.g., gNB in FIG. 31) may transmit to a wireless device(e.g., UE in FIG. 31) one or more RRC messages comprising configurationparameters of one or more SP CSI reporting configurations. Theconfiguration parameters may comprise a value of SP CSI reportingduration. The base station may transmit to the wireless device, at slot(or subframe) n, a MAC CE or DCI indicating an activation of a SP CSIreporting configuration of the one or more SP CSI reportingconfigurations. The base station may start transmitting one or more SPCSI-RSs at slot (or subframe) n+k. In an example, k may be zero or aninteger greater than zero, configured by an RRC message, or bepredefined as a fixed value.

As shown in FIG. 31, after or in response to receiving the MAC CE or theDCI, the wireless device may perform CSI measurements on one or moreCSI-RSs according to the activated SP CSI reporting configuration. In anexample, after or in response to receiving the MAC CE or the DCI, thewireless device may transmit one or more SP CSI reports (e.g., based onthe CSI measurements) at slot/subframe n+k+m, n+k+m+l, n+k+m+2*1, etc.,with a periodicity of/subframes (or slots). The periodicity (a value ofl) may be configured in an RRC message. In an example, the UE may keeptransmitting the one or more SP CSI reports with the periodicity in theSP CSI reporting duration (e.g., SP CSI reporting duration in FIG. 31).In an example, the UE may stop transmitting the one or more SP CSIreports after the SP CSI reporting duration (e.g., a timer associatedwith the SP CSI report duration expires).

In an example, implicitly deactivating a SP CSI reporting by configuringa SP CSI reporting duration (e.g., the procedure shown in FIG. 31) mayreduce signaling overhead but may not be flexible. In an example,explicitly deactivating a SP CSI reporting by transmitting a MAC CE orDCI indicating the deactivation may enable the base station dynamicallyto deactivate the SP CSI reporting but may increase the signal overhead.

FIG. 32 shows an example of SP CSI reporting on a BWP of a cell. In anexample, a base station (e.g., gNB in FIG. 32) may transmit to awireless device (e.g., UE in FIG. 32) one or more RRC messagescomprising configuration parameters of one or more SP CSI reportingconfigurations and one or more BWPs (e.g., BWP 0, BWP 1, BWP 2, etc. inFIG. 32) of a cell. The UE may receive one or more PDCCH/PDSCH on anactive DL BWP (e.g., BWP 0).

As shown in FIG. 32, in subframe n, the gNB may transmit to the wirelessdevice a DCI indicating an active DL BWP switching (e.g., from BWP 0 toBWP 2). The wireless device may switch the active DL BWP from BWP 0 toBWP 2, in response to the DCI. In an example, a gNB may transmit one ormore MAC CE comprising one or more parameters indicatingactivation/deactivation of one or more CSI-RS resource set, foraperiodic CSI reporting. In an example, a gNB may transmit a DL BWPswitching DCI before transmitting a SP CSI reportingactivation/deactivation MAC CE, or an aperiodic CSI reportingactivation/deactivation MAC CE.

In an example, a gNB may transmit a MAC CE for SP CSI reportingactivation after transmitting the DCI for an active DL BWP switching. Asshown in FIG. 32, the gNB may transmit a MAC CE indicating an activationof a SP CSI reporting configuration for BWP 2, at subframe n+k. The gNBmay transmit the MAC CE to the wireless device in order to obtain fromthe wireless device CSI report of BWP 2 for dynamic scheduling on BWP 2.In an example, a HARQ-based retransmission mechanism may be employed bythe gNB and/or the UE for the transmission of the MAC CE. Theretransmission mechanism may ensure the UE correctly receive the MAC CE.

In an example, the UE may transmit a first SP CSI report of BWP 2 forthe activated SP CSI reporting configuration at subframe n+k+m. In anexample, m may be a time offset between the UE receives the MAC CE forSP CSI reporting activation and the UE transmits a first SP CSI report.m may be configured based on capability of UE and/or network or be fixedas a predefined value. In an example, a value of m may be determinedbased on: a time used for a reception of the MAC CE with possibleretransmissions employing a HARQ mechanism; a time used for RF chainretuning at the UE's receiver; and/or a time used for measuring one ormore CSI-RSs.

As shown in FIG. 32, after or in response to receiving the MAC CE (e.g.,slot n+k), the wireless device may transmit one or more SP CSI reportsat slot/subframes n+k+m, n+k+m+l, n+k+m+2*l, etc., with a periodicityof/subframes (or slots). The periodicity (a value of l) may beconfigured in an RRC message. In an example, the UE may keeptransmitting the one or more SP CSI reports with the periodicity untilreceiving a second MAC indicating a deactivation of the SP CSI reportconfiguration (e.g., as shown in FIG. 30). In an example, the UE maykeep transmitting the one or more SP CSI reports with the periodicityuntil an expiry of a timer associated with a SP CSI reporting duration(e.g., as shown in FIG. 31).

In an example, when configured with multiple BWPs, a UE may switch anactive DL BWP to a first DL BWP if receiving a DCI indicating the activeDL BWP switching to the first DL BWP. The UE may start a BWP inactivitytimer in response to the DCI. The UE may receive on the first DL BWP asecond DCI indicating downlink assignments or uplink grants. The UE mayrestart the BWP inactivity timer in response to the second DCI. The UEmay switch to a default DL BWP after or in response to an expiry of theBWP inactivity timer.

In an example, one or more CSI-RSs on a DL BWP may or may not betransmitted, depending on RRC configuration. In an example, a basestation may not transmit one or more aperiodic CSI-RSs when the basestation does not transmit a DCI triggering transmission of the one ormore aperiodic CSI-RSs. In an example, a base station may transmit oneor more SP CSI-RSs if triggered by a first MAC CE or a first DCI. Thebase station may stop the transmission of the one or more SP CSI-RSsafter a transmission duration configured by an RRC message, or after orin response to a second MAC CE or a second DCI. In an example, a gNB maynot transmit CSI-RSs (aperiodic, periodic, or semi-persistent) on a DLBWP for the UE if the DL BWP is not an active BWP of the UE. Nottransmitting the CSI-RSs (aperiodic, periodic, or semi-persistent) forthe UE may save the transmission power of the gNB, and/or reduce theinterference to other channels or other gNBs.

FIG. 33 shows an example of SP CSI reporting on a BWP of a cell. In anexample, a base station (e.g., gNB in FIG. 33) may transmit to awireless device (e.g., UE in FIG. 33) one or more RRC messagescomprising configuration parameters of one or more SP CSI reportingconfigurations and one or more BWPs (e.g., BWP 0, BWP 1, BWP 2, etc. inFIG. 33) of a cell. The UE may receive one or more PDCCH/PDSCH on anactive DL BWP (e.g., BWP 1).

In an example, a gNB may transmit a MAC CE for SP CSI reportingactivation before transmitting the DCI for BWP switching. As shown inFIG. 33, in subframe/slot n, the gNB may transmit a MAC CE indicating anactivation of a SP CSI reporting configuration for BWP 2. The gNB maytransmit the MAC CE to the wireless device in order to obtain from thewireless device CSI report of BWP 2 for dynamic scheduling on BWP 2. Inan example, a HARQ-based retransmission mechanism may be employed by thegNB and/or the UE for the transmission of the MAC CE. The retransmissionmechanism may ensure the UE correctly receive the MAC CE.

As shown in FIG. 33, the gNB may transmit to the UE a DCI indicating anactive DL BWP switching (e.g., from BWP 1 to BWP 2) at slot/subframen+k. The UE may switch the active DL BWP from BWP 1 to BWP 2, inresponse to the DCI.

In an example, after or in response to the MAC CE for SP CSI reportingactivation and the DCI for active BWP switching, a UE may transmit afirst SP CSI report for BWP 2 at subframe n+k+m. In an example, m may bea time offset between the UE receives the DCI for the active BWPswitching and the UE transmits the first SP CSI report. A value of m maybe configured based on capability of UE and/or network or be fixed as apredefined value. In an example, a value of m may be determined basedon: a time used for detecting the DCI; a time used for RF chainretuning; and/or a time used for measuring one or more CSI-RSs.

In existing 3GPP standard specifications, a UE may switch to a defaultDL BWP in response to an expiry of a BWP inactivity timer whenconfigured with multiple BWPs. The expiry of the BWP inactivity timermay be due to the wireless device missing one or more DCIs for DLscheduling on an active DL BWP (e.g., a DL BWP other than the default DLBWP). In this case, a gNB may not have information about UE missing theone or more DCIs. In an example, the gNB may not be able determine onwhich BWP (e.g., the active BWP or the default BWP) the UE is operating.Implementation of existing technologies may cause communicationinterruption due to misalignment between the gNB and the UE regarding astate of a DL BWP. Implementation of existing technologies may increasesignaling overhead of the gNB and/or power consumption of the UE torecover the communication interruption. Implementation of existingtechnologies may increase transmission delay between the gNB and the UEwhen configured with multiple BWPs in a cell. There is a need to enhanceBWP switching mechanism for reducing communication interruption. Exampleembodiments may improve alignment between the gNB and the UE regarding astate of a DL BWP. Example embodiments may reduce signal overhead andpower consumption for maintaining an uninterrupted communication betweenthe gNB and the UE when active BWP switching occurs (e.g., triggered bya DCI or an expiry of a BWP inactivity timer). Example embodiments mayimprove transmission delay between the gNB and the UE when configuredwith multiple BWPs in the cell. Example embodiments may comprise anenhanced BWP switching including an enhanced CSI reporting when a UEswitches a BWP. A base station implementing example embodiments maydetermine a timing of BWP switching based on the enhanced BWP CSIreporting.

FIG. 34 shows an example embodiment of BWP switching including anenhanced CSI report mechanism. In an example, a base station (e.g., gNBin FIG. 34) may transmit to a wireless device (e.g., UE in FIG. 34) oneor more RRC messages comprising one or more BWP configuration parametersof one or more BWPs of a cell. The one or more RRC messages may furtherindicate a BWP timer value of a BWP inactivity timer. The one or moreBWPs may comprise a default BWP. The cell may be a PCell or a SCell. Theone or more BWP configuration parameters of a BWP of the one or moreBWPs may comprise at least one of: a BWP index; one or more RS (e.g.,SSB and/or CSI-RS) resource settings; one or more CSI reportingsettings; and one CSI measurement setting.

As shown in FIG. 34, the gNB may communicate with the UE on an activeBWP (e.g., BWP 1). The gNB may transmit one or more CSI-RS (e.g., P/SPCSI-RS) on BWP 1. The UE may transmit to the gNB one or more CSI reportsbased on one or more CSI-RSs of BWP1, e.g., for dynamic downlinkscheduling at the gNB. In an example, on BWP 1, the gNB may transmit oneor more periodic CSI-RSs indicated by the one or more CSI-RS resourcesettings, if at least a first setting of the one or more CSI-RS resourcesettings comprise one or more periodic CSI-RS. In an example, on BWP 1,the gNB may transmit one or more SP CSI-RSs indicated by the one or moreCSI-RS resource settings, if at least a second setting of the one ormore CSI-RS resource settings comprise one or more SP CSI-RSs. The gNBmay transmit the one or more SP CSI-RSs, after or in response totransmitting a MAC CE indicating an activation of a SP CSI reportingconfiguration.

As shown in FIG. 34, the gNB may transmit to the UE a DCI indicatingactive BWP switching (e.g., BWP 1→2) at subframe/slot n. The UE mayswitch from BWP 1 to BWP 2 as an active BWP in response to the DCI. TheUE may start (or restart) the BWP inactivity timer in response to theDCI.

In an example, after or in response to the DCI indicating an active BWPswitching from BWP 1 to BWP 2, a UE may stop measuring on one or moreCSI-RS of BWP 1, and/or stop reporting one or more CSI measurement forthe old BWP (e.g., 1). In an example, a UE may transmit one or more CSIreports (e.g., P/SP/A CSI) measured on the one or more CSI-RStransmitted on BWP 2, at subframe/slot n+k. A value of k may beconfigured by an RRC message, or be a predefined value. The UE maytransmit the one or more CSI reports with a periodicity of m (e.g., atsubframes/slots n+k+m, n+k+2*m, etc.). The periodicity (a value of m)may be configured in an RRC message.

In an example, a gNB may transmit one or more first RSs (e.g., P/SP/ASSBs/CSI-RSs) on BWP 2, in response to transmitting the DCI indicatingactive BWP switching from BWP 1 to BWP 2. The gNB may keep transmittingone or more second RS (e.g., P/SP SSB/CSI-RS) on the default BWP (e.g.,BWP 0), even after sending the DCI for BWP switching. In the exampleembodiment, keeping the transmission of the one or more second RS on thedefault BWP may reduce CSI measurement error in case a UE switches tothe default BWP due to miss-detecting a DCI on the active BWP. In theexample embodiment, keeping the transmission of the one or more secondRS one the default BWP may enable the UE correctly and timely transmitCSI reports when perform BWP switching to the default BWP. Exampleembodiments may reduce signal overhead and power consumption formaintaining an uninterrupted communication between the gNB and the UEwhen BWP switching occurs (e.g., triggered by a DCI or an expiry of aBWP inactivity timer). Example embodiments may improve transmissiondelay between the gNB and the UE when configured with multiple BWPs inthe cell. Example embodiments may comprise an enhanced BWP switchingmechanism based on CSI report (e.g., periodic, aperiodic, orsemi-persistent).

In an example, when a BWP inactivity timer expires at subframe/slot x, aUE may switch the active BWP from BWP 2 to the default BWP (e.g., BWP0). In an example, the BWP inactivity timer may expire in response to noDCI (e.g., for downlink scheduling or uplink grant) received during theBWP inactivity timer being running.

In an example, as shown in FIG. 34, a UE may start transmitting one ormore CSI reports (e.g., P/SP/A CSI) for the default BWP (e.g., BWP 0),at subframe/slot x+y, in response to an expiry of the BWP inactivitytimer. A value of y may be configured by an RRC message, or be apredefined value. In an example, the value of y may be different fordifferent CSI reporting (e.g., P/SP/A CSI).

In an example embodiment, a UE may perform CSI measurements on one ormore RSs (e.g., SSBs/CSI-RSs) on the default BWP, if a gNB keepstransmitting the one or more RSs on the default BWP. The UE may transmitCSI reports (e.g., valid) based on CSI measurements for the default BWP.In response to receiving the CSI reports, the gNB may transmit one ormore DCIs on the default BWP indicating dynamic data scheduling withsuitable transmission format (e.g., MCS, precoding, rank), based on theCSI report. In the example embodiment, transmitting RSs on a default BWP(e.g., even when the default DL BWP is not an active BWP) may reduce thetime delay for acquiring CSI, when switching to a default BWP. Exampleembodiments may improve transmission delay between the gNB and the UEwhen configured with multiple BWPs in the cell. Example embodiments mayimprove delay of BWP switching.

In an example, when a SCell configured with a default BWP isdeactivated, the transmission of one or more RSs on the default BWP ofthe SCell may be stopped.

FIG. 35 shows an example of the embodiment. In an example, abase station(e.g., gNB in FIG. 35) may transmit to a wireless device (e.g., UE inFIG. 35) a DCI indicating an active BWP switching (e.g., from BWP 1 toBWP 2) at subframe/slot n. The gNB may start a RS transmission timerwith a timer value (e.g., in units of subframe or slot). During the RStransmission timer being running, the gNB may keep transmit one or moreRSs (e.g., SSBs/CSI-RSs) on the default BWP. When the RS transmissiontimer expires, the gNB may stop transmitting the one or more RSs on thedefault BWP. In an example, the RS transmission timer may expire inresponse to not transmitting to the UE a DCI or MAC CE indicating one ormore CSI report for the default BWP. The timer value may be configuredin the RRC message, or be a predefined value.

As shown in FIG. 35, when receiving a DCI indicating an active BWPswitching from BWP 1 to BWP 2 at subframe n, the UE may start (orrestart) a BWP inactivity timer. The UE may start the RS transmissiontimer after or in response to the DCI. In an example, the UE may assumethat the RSs on the default BWP may be available (or transmitted by thegNB) until the RS transmission timer expires. In an example, a UE mayswitch from BWP 2 to the default BWP (e.g., BWP 0) when receiving asecond DCI indicating an active BWP switching from BWP 2 to BWP 0, orwhen the BWP inactivity timer expires.

In an example embodiment, a UE may perform CSI measurements one or moreRSs (e.g., SSBs/CSI-RSs) on a default BWP in response to an expiry ofthe BWP inactivity timer and the RS transmission timer being running.The UE may transmit one or more CSI reports based on CSI measurements onthe default BWP.

In an example embodiment, transmitting one or more RSs on a default BWPwith a configured time period (e.g., even when an active BWP of a UE isnot the default BWP) may reduce CSI-RS activation/deactivation MAC CEoverhead, e.g., when BWP switching is frequent. Transmitting one or moreRSs on a default BWP with a configured time period may reduce CSIreporting delay, e.g., when BWP switching is frequent. Implementing theexample embodiment may enable a UE to quickly transmit a (valid) CSIreport for the default BWP based on the one or more RSs transmitted withthe configured time period.

In an example, a gNB may transmit one or more RSs (e.g., SSBs/CSI-RSs)on a default BWP (e.g., which may be or may not be an active BWP) withan unlimited duration (e.g., when the RS transmission timer is notconfigured), or a configured duration (e.g., when the RS transmissiontimer is configured with a timer value), depending on the networkconfiguration. The gNB may determine the RS transmission timer valuebased on at least one of: a BWP switching speed parameter (e.g., slowBWP switching or fast BWP switching); a BWP switching frequencyparameter (e.g., frequent BWP switching or infrequent BWP switching);frequent BWP switching, or infrequent BWP switching; and/or a UE'scapability.

In an example, a gNB may transmit to a UE one or more RRC messagescomprising one or more parameters indicating a time period during whichone or more RSs (e.g., SSBs/CSI-RSs) are transmitted on a default BWP.Example embodiments may reduce signal overhead and power consumption formaintaining an uninterrupted communication between the gNB and the UEwhen BWP switching occurs (e.g., triggered by a DCI or an expiry of aBWP inactivity timer). Example embodiments may improve transmissiondelay between the gNB and the UE when configured with multiple BWPs inthe cell.

In existing technologies, when receiving a DCI indicating an active BWPswitching from a first BWP to a second BWP, a UE may transmit one ormore CSI reports to a gNB, e.g., to confirm a reception of the DCI. Theone or more CSI reports may be based on one or more CSI measurements ofone or more RSs (e.g., SSBs/CSI-RSs) on the second BWP indicated in theDCI. When receiving the one or more CSI reports, the gNB may determinethat the UE receives the DCI, and/or the UE completes the active BWPswitching. In an example, after receiving the one or more CSI reports,the gNB may communicate with the UE on the second BWP.

In an example, a UE may miss-detect a DCI indicating an active BWPswitching from a first BWP to a second BWP. In an example, the UE maykeep transmitting one or more CSI reports for the first BWP due to themisdetection of the DCI. In this case, in response to receiving the oneor more CSI reports, a gNB may mistakenly determine that the UE receivesthe DCI and completes the active BWP switching to the second DL BWP.Existing technologies may cause communication interruption due to themisdetection of the DCI. Existing technologies may introduce delay forrecovering the communication interruption. Existing technologies mayincrease power consumption and/or signal overhead to setupcommunications on the second DL BWP. There is a need to enhance CSIreporting mechanism for BWP switching. Example embodiments may reducecommunication interruption due to the misdetection of the DCI. Exampleembodiments may reduce transmission delay, power consumption and/orsignal overhead for BWP switching.

In an example, a gNB may transmit one or more RRC message comprising oneor more parameters comprising at least: one or more BWP configurationparameters for one or more DL BWPs; a first BWP identifier indicating afirst active DL BWP; a second BWP identifier indicating a default DLBWP. In an example, a DL BWP indicated in a first DL BWP identifier maybe the default DL BWP in response to the second DL BWP identifier beingabsent in the one or more RRC messages. In an example, the one or moreBWP configuration parameters for a DL BWP may comprise at least one of:a DL BWP index or indicator; one or more CSI-RS resource settings; oneor more CSI reporting settings; and one CSI measurement setting.

In an example, a gNB may communicate with a UE on a first BWP of a cell.The gNB may transmit to a UE a DCI indicating an active BWP switchingfrom the first BWP to a second BWP. The first BWP and the second BWP maybe configured on the cell (e.g., PCell or SCell). In an example, the UEmay or may not receive the DCI for the active BWP switching.

In an example, in response to receiving the DCI for the active BWPswitching (e.g., from the first BWP to the second BWP), the UE maytransmit one or more CSI reports (e.g., P/A/SP CSI reports) for thesecond BWP. In an example, the transmission of the one or more CSIreports for the second BWP may be triggered by an RRC message, a MAC CE,and/or a second DCI. In an example, a UE may receive a MAC CE triggeringthe one or more CSI (e.g., aperiodic or semi-persistent) reports for thesecond BWP after receiving the DCI for the active BWP switching (e.g.,as shown in FIG. 32). The UE may receive a MAC CE triggering the one ormore CSI (e.g., aperiodic or semi-persistent) reports for the second BWPbefore receiving the DCI for the active BWP switching (e.g., as shown inFIG. 33). The one or more CSI reports may comprise at least one of: a DLBWP indicator; PMI; CQI; interference; RI; RSRP; and/or CRI. The DL BWPindicator may indicate a DL BWP on which the UE measure one or more RSs(e.g., SSBs/CSI-RSs). In an example, in response to detecting the DCIindicating BWP switching to the second BWP, the DL BWP indicator in theone or more CSI reports may indicate the second BWP.

In an example, in response to not receiving the DCI for the active BWPswitching (e.g., from the first BWP to the second BWP), the UE maytransmit (or keep transmitting) one or more CSI reports (e.g., P/A/SPCSI reports) for the first BWP. In an example, the transmission of theone or more CSI reports for the first BWP may be triggered by an RRCmessage, a MAC CE, and/or a second DCI. The one or more CSI reports maycomprise at least one of: a DL BWP indicator; PMI; CQI; interference;RI; RSRP; and/or CRI. The DL BWP indicator may indicate a DL BWP onwhich the UE measure one or more CSI-RS. In an example, in response tonot receiving the DCI indicating BWP switching to the second BWP, the DLBWP indicator in the one or more CSI reports may indicate the first BWP.

In an example, in response to receiving the one or more CSI reports, agNB may determine whether the UE receives the DCI indicating the activeBWP switching and/or the UE completes the active BWP switching bychecking the DL BWP indicator comprised in the one or more CSI reports.In an example, if the DL BWP indicator in the one or more CSI reportsindicates the second BWP, the gNB may determine that the UE receives theDCI indicating the active BWP switching and/or the UE completes theactive BWP switching. In response to the DL BWP indicator indicating thesecond BWP, the gNB may start communicating with the UE on the secondBWP, e.g., for data packet or downlink control transmission on thesecond BWP. In an example, if the DL BWP indicator in the one or moreCSI report indicates the first BWP, the gNB may determine that the UEdoes not receive the DCI indicating the active BWP switching. The gNBmay, in response to the DL BWP indicator indicating the first BWP,retransmit the DCI, or keep communicating with the UE on the first BWP.

In existing 3GPP standard specifications, CSI reports may not comprise afield indicating a BWP, or a cell. In contrast, in the exampleembodiment, having a DL BWP identifier in CSI report may enable a gNBquickly determine whether a UE receives a DCI for active BWP switching.In the example embodiment, having a DL BWP identifier in CSI report mayenable a gNB quickly determine on which BWP a UE is operating when BWPswitching is triggered. Example embodiments may reduce communicationinterruption due to the misdetection of the DCI. Example embodiments mayreduce transmission delay, power consumption and/or signal overhead forBWP switching.

FIG. 36 shows an example embodiment of enhanced CSI reporting mechanismfor BWP switching. In an example, a base station (e.g., gNB in FIG. 36)may transmit to a wireless device (e.g., UE in FIG. 36) one or more RRCmessages comprising one or more BWP parameters of a first plurality ofDL BWPs (e.g., DL BWP 0, 1, 2, 3) and a second plurality of UL BWPs(e.g., UL BWP 0, 1, 2, 3). The first plurality of DL BWPs and the secondplurality of UL BWPs may be configured on a cell, or different cells.The one or more BWP parameters may further indicate one or more PUCCHresources, for one or more CSI reports (e.g., periodic, aperiodic,semi-persistent), on at least one of the second plurality of UL BWPs,e.g., if a cell comprising the second plurality of UL BWPs is a PCell,or a PUCCH secondary cell.

In an example, a first DL BWP of the first plurality of DL BWPs may beassociated with (e.g., linked to) a first UL BWP of the second pluralityof UL BWPs. In an example, the association between the first DL BWP andthe first UL BWP may be configured in the one or more RRC messages. Inan example, the association may be a one-to-one linkage. For example, DLBWP 0 may be linked to UL BWP 0. DL BWP 1 may be linked to UL BWP 1(e.g., different from UL BWP 0), etc. In the example, different DL BWPsare associated with different UL BWPs.

In an example, one or more BWP parameters of an UL BWP (e.g., UL BWP 0,1, 2, or 3) of the second plurality of BWPs may indicate one or morePUCCH (or PUSCH) resources on the UL BWP, e.g., if a cell comprising theUL BWP is a PCell or a PUCCH secondary cell. In an example, a first DLBWP of the first plurality of DL BWPs may be associated with a firstPUCCH resource of the one or more PUCCH resources on the UL BWP, asecond DL BWP of the first plurality of DL BWPs may be associated with asecond PUCCH resource of the one or more PUCCHs on the UL BWP. Forexample, DL BWP 1 may be associated with 1^(st) PUCCH on the UL BWP, andDL BWP 2 may be associated with 2^(nd) PUCCH on the UL BWP, etc.

In an example, first CSI reports (e.g., periodic, aperiodic,semi-persistent) for a first DL BWP may be associated with a first PUCCHresource on the UL BWP, second CSI reports (e.g., periodic, aperiodic,semi-persistent) for a second DL BWP may be associated with a secondPUCCH resource on the UL BWP. For example, as shown in FIG. 36, firstCSI reports for DL BWP 1 may be associated with 1^(st) PUCCH on the ULBWP, and second CSI reports for DL BWP 2 may be associated with 2^(nd)PUCCH on the UL BWP, etc. In an example, the CSI reports may comprise atleast one of: periodic CSI reports, aperiodic CSI reports, and/orsemi-persistent CSI reports. In an example, CSI reports (e.g., first CSIreports for DL BWP 1, and/or second CSI reports for DL BWP 2) may betriggered by an RRC message, a MAC CE, and/or a DCI.

In an example, a gNB may communicate with a UE on a first DL BWP and afirst UL BWP. The UE may transmit one or more first CSI reports for thefirst DL BWP via a first PUCCH resource of the first UL BWP. In anexample, the one or more first CSI reports may comprise at least one of:periodic CSI reports, aperiodic CSI reports, and/or semi-persistent CSIreports. In an example, the one or more first CSI reports may betriggered by an RRC message, a MAC CE, and/or a DCI.

In an example, as shown in FIG. 36, the UE may receive a DCI indicatingan active BWP switching from the first DL BWP (e.g., DL BWP 1 in FIG.36) to a second DL BWP (e.g., DL BWP 2 in FIG. 36). In an example, afteror in response to receiving the DCI, the UE may switch the active BWP tothe second DL BWP. The UE may, after or in response to the switching,transmit one or more second CSI reports for the second DL BWP via asecond PUCCH resource of the UL BWP.

In an example, the UE may not receive (or miss detect) the DCIindicating the active BWP switching from the first DL BWP to the secondDL BWP. In response to not receiving the DCI, the UE may keeptransmitting the one or more first CSI reports for the first DL BWP viathe first PUCCH resource of the UL BWP.

In an example, a gNB may monitor one or more of the one or more PUCCHresources of the UL BWP, e.g., after or in response to transmitting theDCI indicating the active BWP switching. In an example, when the gNBreceives the one or more first CSI reports on the first PUCCH resourceon the UL BWP, the gNB may determine that the UE does not receive theDCI. The gNB may, in response to receiving the one or more first CSIreports on the first PUCCH resource, perform further actions comprisingat least one of: retransmitting the DCI; and/or keeping communicatingwith the UE on the first DL BWP. In an example, when the gNB receivesthe one or more second CSI reports on the second PUCCH resource on theUL BWP, the gNB may determine that the UE receives the DCI and/or the UEcompletes the active BWP switching from the first DL BWP to the secondDL BWP. The gNB may, in response to receiving the second CSI reports onthe second PUCCH resource, communicate with the UE on the second DL BWP,e.g., for data packet and/or control information transmission. Inexisting technologies, a base station may allocate one PUCCH resource ofan UL BWP for CSI reports for multiple DL BWPs, where the PUCCH resourceis shared for the CSI reports for multiple DL BWPs. In contrast, in theexample embodiment, allocating different PUCCH resources of an UL BWPfor CSI reports for different DL BWPs may enable a gNB quickly determinewhether a UE receives a DCI for an active BWP switching. In the exampleembodiment, allocating different PUCCH resources of an UL BWP for CSIreports for different DL BWPs may enable a gNB quickly determine onwhich BWP a UE is operating when BWP switching is triggered. Exampleembodiments may reduce communication interruption due to themisdetection of the DCI. Example embodiments may reduce transmissiondelay, power consumption and/or signal overhead for BWP switching.

FIG. 37 shows an example embodiment of enhanced CSI reporting mechanismfor BWP switching. In an example, a base station (e.g., gNB in FIG. 37)may transmit to a wireless device (e.g., UE in FIG. 37) one or more RRCmessages comprising one or more BWP parameters of a first plurality ofDL BWPs (e.g., DL BWP 0, 1, 2, and/or 3) and an UL BWP. The one or moreBWP parameters may further indicate one or more PUCCH resources on theUL BWP, for one or more CSI reports (e.g., periodic, aperiodic,semi-persistent), e.g., if a cell comprising the UL BWP is a PCell, or aPUCCH secondary cell.

In an example, first CSI reports for a first DL BWP may be associatedwith a first PUCCH resource on the UL BWP, and second CSI reports for asecond DL BWP may be associated with a second PUCCH resource on the ULBWP. For example, as shown in FIG. 37, first CSI reports for DL BWP 1may be associated with 1^(st) PUCCH on the UL BWP, and second CSIreports for DL BWP 2 may be associated with 2^(nd) PUCCH on the UL BWP,etc.

In an example, a gNB may communicate with a UE on the first DL BWP andthe UL BWP. In an example, the gNB may transmit one or more MAC CEsactivating a first SP CSI reporting configuration for the first DL BWPand a second SP CSI reporting configuration for a second DL BWP. The gNBmay transmit the one or more MAC CEs at different time. The gNB maytransmit a first MAC CE activating the first SP CSI reportingconfiguration for the first DL BWP before or after the gNB transmits asecond MAC CE activating the second SP CSI reporting configuration forthe second DL BWP. After, or in response to receiving the one or moreMAC CEs, the UE may transmit one or more first SP CSI reports for thefirst DL BWP via a first PUCCH resource of the first UL BWP, e.g., whenthe first DL BWP is an active DL BWP. In an example, the one or morefirst SP CSI reports may be measured based on one or more CSI-RSs of thefirst DL BWP, associated with the activated first SP CSI reportingconfiguration. In an example, the one or more first SP CSI reports maycomprise at least one of: a PMI; a CQI; a RI; a CRI; and/or a L1-RSRPvalue, indicated by one or more configuration parameters of theactivated first SP CSI reporting configuration. In an example, thetransmissions of the one or more first SP CSI reports may be performedwith a periodicity associated with the activated first SP CSI reportingconfiguration.

In an example, as shown in FIG. 37, the UE may receive a DCI indicatingan active BWP switching from the first DL BWP (e.g., DL BWP 1 in FIG.37) to a second DL BWP (e.g., DL BWP 2 in FIG. 37). In an example, afteror in response to the DCI, the UE may switch the active BWP to thesecond DL BWP. The UE may, after or in response to the switching,transmit one or more second SP CSI reports for the second DL BWP via asecond PUCCH resource of the UL BWP, e.g., when a second SP CSI reportconfiguration associated with the one or more second SP CSI reports isactivated. The one or more second SP CSI reports may be based on theactivated second SP CSI reporting configuration. In an example, the UEmay not receive (or miss detect) the DCI indicating the active BWPswitching from the first DL BWP to the second DL BWP. In response to notreceiving the DCI, the UE may keep transmitting the one or more first SPCSI reports for the first DL BWP via the first PUCCH resource of the ULBWP.

In the example embodiment, allocating different PUCCH resources of an ULBWP for SP CSI reports for different DL BWPs may enable a gNB quicklydetermine whether a UE receives a DCI for an active BWP switching. Inthe example embodiment, allocating different PUCCH resources of an ULBWP for SP CSI reports for different DL BWPs may enable a gNB quicklydetermine on which BWP a UE is operating when BWP switching istriggered. Example embodiments may reduce communication interruption dueto the misdetection of the DCI. Example embodiments may reducetransmission delay, power consumption and/or signal overhead for BWPswitching.

In an example, a wireless device may receive one or more RRC messagecomprising one or more parameters comprising at least: one or moreconfiguration parameters of one or more DL BWPs. The one or moreconfiguration parameters of a DL BWP may comprise at least one of: oneor more RS (e.g., SSB/CSI-RS) resource settings; one or more CSIreporting settings; and/or one CSI measurement setting. The wirelessdevice may monitor a PDCCH for a downlink control information (DCI)comprising one or more parameters indicating an active BWP switching toa first BWP. In an example, after or in response to the DCI, thewireless device may transmit one or more CSI reports comprising a BWPidentifier indicating the first BWP and one or more CSI measurementscomprising at least one of: CQI; PMI; RSRP; RI; CRI. In an example, theone or more CSI measurements may be employed on the DL BWP indicated bythe second BWP identifier.

In an example, a wireless device may receive one or more messagescomprising configuration parameters of a cell. The cell may comprise afirst DL BWP, a second DL BWP and at least an UL BWP. The configurationparameters may comprise first parameters of first UL control channel(e.g., PUCCH) resource on the at least UL BWP and second parameters ofsecond UL control channel resource on the at least UL BWP. In anexample, the first UL control channel resource may be associated withfirst CSI reports of the first DL BWP. The second UL control channelresource may be associated with second CSI reports of the second DL BWP.The wireless device may transmit, via the first UL control channelresource of an UL BWP of the at least UL BWP, the first CSI reports ofthe first DL BWP. The wireless device may receive a DCI indicatingswitching from the first DL BWP to the second DL BWP as an active BWP.The wireless device may transmit, after receiving the DCI, the secondCSI reports of the second DL BWP via the second UL control channelresource of the UL BWP of the at least UL BWP.

In existing 3GPP standard specifications, a wireless device may receivea DCI indicating activation of SP CSI reporting on PUSCH. After or inresponse to the DCI, the wireless device may transmit one or more SP CSIreports on PUSCH according a SP CSI reporting configuration indicated bythe DCI. In an example, the wireless device may receive a MAC CEindicating activation of SP CSI reporting on PUCCH. After or in responseto the MAC CE, the wireless device may transmit one or more SP CSIreports on PUCCH according to a SP CSI reporting configuration indicatedby the MAC CE. In existing technologies, the wireless device may keeptransmitting SP CSI reports (e.g., on PUCCH or PUSCH) until the wirelessdevice receives a deactivation command (e.g., a DCI or a MAC CE)indicating a deactivation of a SP CSI reporting configuration. In anexample, the wireless device may perform an active BWP (e.g., DL or ULor both) switching, during an ongoing transmission of the one or more SPCSI reports (e.g., on PUSCH or PUCCH). The wireless device may keep thetransmission of the SP CSI reports for a first BWP (or on the first BWPwhen the first BWP is an UL BWP) even after the wireless device switchesfrom the first BWP to a second BWP as an active BWP. Implementing theexisting technologies may cause the wireless device to unnecessarilytransmit SP CSI reports for an inactive BWP (e.g., the first BWP in theexample). In an example, a base station may receive the SP CSI reportsfor an inactive BWP. The base station may not be able to determine onwhich BWP the wireless device is operating. Implementing the existingtechnologies may increase power consumption for a wireless device.Implementing the existing technologies may increase uplink resource(e.g., PUCCH or PUSCH) consumption of the wireless device. There is aneed to enhance SP CSI reporting mechanism when a wireless deviceperforms an active BWP switching. Example embodiments of enhanced SP CSIreporting mechanism may reduce misalignment between a base station and awireless device regarding a state of a BWP. Example embodiments mayimprove signaling overhead, power consumption, transmission delay,and/or uplink resource consumption of a base station and/or a wirelessdevice. Example embodiments may improve spectrum efficiency of a systemwhen SP CSI reporting is configured.

FIG. 38 shows an example embodiment of enhanced SP CSI reportingmechanism. In an example, a base station (e.g., gNB in FIG. 38) maytransmit to a wireless device (e.g., UE in FIG. 38) one or more RRCmessages comprising one or more BWP configuration parameters of one ormore BWPs of a cell. The one or more RRC messages may further indicate aBWP timer value of a BWP inactivity timer. The one or more BWPs maycomprise a default BWP. The cell may be a PCell or a SCell. The one ormore BWP configuration parameters of a BWP of the one or more BWPs maycomprise at least one of: a BWP index; one or more RS (e.g., SSB/CSI-RS)resource settings; one or more CSI reporting settings; and one CSImeasurement setting.

In an example, a first DL BWP (e.g., BWP 1 in FIG. 38) may be an activeBWP on which a gNB may communicate with a UE. The UE may transmit one ormore SP CSI reports with a report periodicity for the first DL BWP viaan active UL BWP. The one or more SP CSI reports may be measured basedon one or more RSs (e.g., SSBs/CSI-RSs) on the first DL BWP. Thetransmission of the one or more SP CSI reports may be triggered by a DCIor a MAC CE. In an example, the UE may receive a DCI indicating anactivation of SP CSI reporting on PUSCH. After or in response to theDCI, the UE may transmit one or more SP CSI reports on PUSCH of theactive UL BWP, according to a SP CSI reporting configuration indicatedby the DCI. In an example, the UE may receive a MAC CE indicatingactivation of SP CSI reporting on PUCCH. After or in response to the MACCE, the UE may transmit one or more SP CSI reports on PUCCH of theactive UL BWP, according to a SP CSI reporting configuration indicatedby the MAC CE. The UE may start a BWP inactivity timer after or inresponse to receiving via the first DL BWP a downlink assignment or anuplink grant.

In an example, as shown in FIG. 38, a base station may transmit a DCIindicating an active BWP switching from a first DL BWP (e.g., BWP 1 inFIG. 38) to a second DL BWP (e.g., BWP 2 in FIG. 38). In an example, inresponse to transmitting the DCI, the base station may stop transmissionof one or more first RSs (e.g., SSBs/CSI-RSs) on the first DL BWP. Thebase station may start transmission of one or more second RSs (e.g.,SSBs/CSI-RSs) on the second DL BWP, e.g., before or after transmittingthe DCI. Stopping transmission of RSs (e.g., SSBs/CSI-RSs) for aninactive BWP may save power consumption of a base station and/or reduceinterference to neighbor base stations/cells.

In an example, as shown in FIG. 38, a UE may stop transmission of SP CSIreports for a first BWP (e.g., BWP 1 in FIG. 38) after or in response toreceiving a DCI indicating an active BWP switching from the first DL BWPto a second DL BWP (e.g., BWP 2 in FIG. 38). The UE may stoptransmission of SP CSI reports for the first BWP after or in response toan expiry of a BWP inactivity timer. In the example embodiment, stoppingtransmission of SP CSI reports for an inactive BWP may save powerconsumption, uplink resource consumption of a wireless device, and/ormay reduce interference to other wireless devices. Example embodimentsof SP CSI reporting may reduce misalignment between a base station and awireless device regarding a state of a BWP. Example embodiments mayimprove spectrum efficiency of a system when SP CSI reporting isconfigured.

In an example, a UE may keep transmitting SP CSI reports for a first BWP(e.g., BWP 1 in FIG. 38) after or in response to receiving a DCIindicating an active BWP switching from the first DL BWP to a second DLBWP, until the UE receives a deactivation command indicating adeactivation of a SP CSI reporting configuration. In the embodiment,keeping the transmission of the SP CSI reports for an inactive BWP mayreduce a SP CSI activation/deactivation signaling overhead (e.g., a DCIor a MAC CE), for example, when active BWP switching is frequent, and/orthe first DL BWP and the second DL BWP have a same numerology, oroverlapped bandwidth, and/or a same SP CSI resource setting and/or CSIreporting setting.

In an example, the UE may transmit one or more second SP CSI reportswith a report periodicity for the second DL BWP, after or in response tothe DCI. In an example, a UE may transmit SP CSI reports with a sameperiodicity for the first DL BWP and the second DL BWP, for example, ifthe first DL BWP and the second DL BWP are configured with overlappedbandwidth, a same numerology, and/or a same SP CSI resource settingand/or CSI reporting setting. In an example, when receiving a DCIindicating an active BWP switching from a first DL BWP to a second DLBWP, the UE may autonomously perform CSI measurements based on RSs(e.g., SSBs/CSI-RSs) of the second DL BWP. The UE may transmit SP CSIreports for the new BWP based on the CSI measurements.

In an example, a UE may transmit one or more second SP CSI reports for asecond DL BWP in response to receiving a second MAC CE or DCI indicatingan activation of SP CSI reports for the second DL BWP, after the UEswitches to the second DL BWP as an active DL BWP. In the exampleembodiment, explicitly activation of the SP CSI report (e.g., by a DCIor a MAC CE) after the active DL BWP switching may enable a gNB flexiblyactivate SP CSI reports for the second DL BWP, for example, when thesecond BWP has different RS (e.g., SSB/CSI-RS) resource setting,different central frequency, different numerology, and/or different CSIreporting setting from the first DL BWP.

In an example, embodiments shown in FIG. 38 may apply for a case when ULBWP switching occurs, in a similar way. In an example, a UE may stop afirst transmission of one or more SP CSI reports on a first UL BWP,after or in response to receiving a DCI indicating an UL BWP switchingfrom the first UL BWP to a second UL BWP. The UE may transmit one ormore SP CSI reports on the second UL BWP autonomously. The UE maytransmit one or more SP CSI reports on the second UL BWP after or inresponse to receiving a command indicating an activation of a SP CSIreport configuration for the one or more SP CSI report on the second ULBWP. In the example embodiment, stopping transmission of SP CSI reportson an inactive BWP may save power consumption, uplink resourceconsumption of a wireless device, and/or may reduce interference toother wireless devices. Example embodiments of SP CSI reporting mayreduce misalignment between a base station and a wireless deviceregarding a state of a BWP. Example embodiments may improve spectrumefficiency of a system when SP CSI reporting is configured.

FIG. 39 shows an example embodiment of enhanced SP CSI reportingmechanism. In an example, a base station (e.g., gNB in FIG. 39) maytransmit to a wireless device (e.g., UE in FIG. 39) one or more RRCmessages comprising one or more BWP configuration parameters of one ormore BWPs (e.g., DL or UL) of a cell. The one or more RRC messages mayfurther indicate a BWP timer value of a BWP inactivity timer. The one ormore BWPs may comprise a default BWP. The cell may be a PCell or aSCell. The one or more BWP configuration parameters of a BWP of the oneor more BWPs may comprise at least one of: a BWP index; one or more RS(e.g., SSB/CSI-RS) resource settings; one or more CSI reportingsettings; and one CSI measurement setting.

In an example, a first BWP (e.g., BWP 1 in FIG. 39) may be an active BWPon which a gNB may communicate with a UE. The first BWP may be a DL BWPor an UL BWP. The UE may transmit one or more SP CSI reports with areport periodicity for the first BWP, e.g., when the first BWP is a DLBWP. The UE may transmit one or more SP CSI reports with a reportperiodicity on the first BWP, e.g., when the first BWP is an UL BWP. Theone or more SP CSI reports may be measured based on one or more RSs(e.g., SSBs/CSI-RSs) on the first BWP (e.g., when the first BWP is a DLBWP). The transmission of the one or more SP CSI reports may betriggered by a DCI or a MAC CE. In an example, the UE may receive a DCIindicating an activation of SP CSI reporting on PUSCH. After or inresponse to the DCI, the UE may transmit one or more SP CSI reports onPUSCH of the first BWP, according to a SP CSI reporting configurationindicated by the DCI. In an example, the UE may receive a MAC CEindicating activation of SP CSI reporting on PUCCH. After or in responseto the MAC CE, the UE may transmit one or more SP CSI reports on PUCCHof the first BWP, according to a SP CSI reporting configurationindicated by the MAC CE. The UE may start (or restart) a BWP inactivitytimer after or in response to receiving via an active DL BWP a downlinkassignment or an uplink grant.

In an example, as shown in FIG. 39, a base station may transmit a DCIindicating an active BWP switching from a first BWP (e.g., BWP 1 in FIG.39) to a second BWP (e.g., BWP 2 in FIG. 39). In an example, in responseto transmitting the DCI, when the first BWP and the second BWP are DLBWPs, the base station may stop transmission of one or more first RSs(e.g., SSBs/CSI-RSs) on the first BWP. The base station may starttransmission of one or more second RSs (e.g., SSBs/CSI-RSs) on thesecond BWP, e.g., before or after transmitting the DCI. Stoppingtransmission of RSs (e.g., SSBs/CSI-RSs) on an inactive DL BWP of awireless device may save power consumption of a base station and/orreduce interference to neighbor base stations/cells.

In an example, as shown in FIG. 39, a UE may suspend transmissions of SPCSI reports on a first BWP (e.g., BWP 1 in FIG. 39) after or in responseto receiving a first DCI indicating an active BWP switching from thefirst BWP to a second BWP (e.g., BWP 2 in FIG. 39). The UE may stop thetransmissions of SP CSI reports on the first BWP after or in response toan expiry of a BWP inactivity timer.

When a UE suspends transmission of SP CSI reports on a first BWP, the UEmay stop transmission of SP CSI reports on the first BWP. The UE maymaintain RRC, MAC, and/or PHY configuration parameters of the SP CSIreports. For example, a UE may maintain configuration parameters of SPCSI reports of the first BWP and pause SP CSI report transmission on thefirst BWP. Suspending SP CSI reports transmission may be different fromreleasing SP CSI reports, wherein some of the configuration parametersmay be cleared/released.

In an example, when a first BWP and a second BWP are DL BWPs, a UE maysuspend transmissions of SP CSI reports for the first BWP after or inresponse to receiving a first DCI indicating an active BWP switchingfrom the first BWP to the second BWP. The UE may stop the transmissionsof SP CSI reports for the first BWP after or in response to an expiry ofa BWP inactivity timer.

In an example, the UE may resume the transmission of SP CSI reportsafter or in response to receiving a second DCI indicating the active BWPswitching from the second BWP to the first BWP. In an example, resumingthe transmission of SP reports may be performed without receiving a MACCE for reactivation of the SP CSI reports. In an example, resuming thetransmission of SP reports may comprise transmitting the SP CSI reportson the first BWP according to an activated SP CSI reportingconfiguration associated with the SP CSI reports. In an example, a basestation may resume transmission of RSs (e.g., SSBs/CSI-RSs) on the firstBWP (e.g., when the first BWP is a DL BWP), e.g., before or aftertransmitting the second DCI. In the example embodiment, a UE may suspendSP CSI reports when the UE switches away from a BWP and resume the SPCSI reports when the UE switches back to the BWP. The enhanced SP CSIreport mechanism based on suspending and/or resuming may improve powerconsumption, uplink resource consumption of a wireless device, and/ormay reduce interference to other wireless devices. The enhanced SP CSIreport mechanism based on suspending and/or resuming may reducesignaling overhead and/or may improve spectrum efficiency of a systemwhen SP CSI reporting is configured.

FIG. 40 shows an example embodiment of enhanced SP CSI reportingmechanism when a SP CSI reporting is triggered by a MAC CE. In anexample, a base station (e.g., gNB in FIG. 40) may transmit to awireless device (e.g., UE in FIG. 40) one or more RRC messagescomprising one or more BWP configuration parameters of one or more BWPsof a cell. The one or more RRC messages may further indicate a BWP timervalue of a BWP inactivity timer. The one or more BWPs may comprise adefault BWP. The cell may be a PCell or a SCell. The one or more BWPconfiguration parameters of a BWP of the one or more BWPs may compriseat least one of: a BWP index; one or more RS (e.g., SSB/CSI-RS) resourcesettings; one or more CSI reporting settings; and one CSI measurementsetting.

In an example, a first BWP (e.g., BWP 1 in FIG. 40) may be an active BWPon which a gNB may communicate with a UE. The first BWP may be one of aDL BWP and an UL BWP. In an example, as shown in FIG. 40, the UE mayreceive a MAC CE indicating activation of SP CSI reporting on PUCCH.After or in response to the MAC CE, the UE may transmit one or more SPCSI reports via a PUCCH resource of an active UL BWP (e.g., the firstBWP when the first BWP is an UL BWP), according to a SP CSI reportingconfiguration indicated by the MAC CE. The UE may transmit the one ormore SP CSI reports with a report periodicity via a PUCCH resource ofthe active UL BWP. The one or more SP CSI reports may be measured basedon one or more RSs (e.g., SSBs/CSI-RSs) on an active DL BWP. In anexample, after or in response to the MAC CE, the UE may transmit one ormore SP CSI reports for the first BWP, when the first BWP is a DL BWP.The UE may start (or restart) a BWP inactivity timer after or inresponse to receiving via the DL BWP a downlink assignment or an uplinkgrant.

In an example, as shown in FIG. 40, a base station may transmit to a UEa first DCI indicating an active BWP switching from a first BWP (e.g.,BWP 1 in FIG. 40) to a second BWP (e.g., BWP 2 in FIG. 40). After or inresponse to the first DCI, the UE may suspend transmissions of SP CSIreports. The UE may suspend the transmissions of SP CSI reports after orin response to an expiry of a BWP inactivity timer. In an example, theUE may resume the transmissions of SP CSI reports after or in responseto receiving a second DCI indicating the active BWP switching from thesecond BWP to the first BWP. In an example, the UE may resume thetransmissions of SP CSI reports after or in response to an expiry of aBWP inactivity timer. In the example embodiment, when transmission of SPCSI reports is triggered based on a MAC CE, a UE may suspend SP CSIreports when the UE switches away from a BWP and resume the SP CSIreports when the UE switches back to the BWP, for reducing signaloverhead for a second MAC CE (e.g., for reactivating the SP CSIreports). The enhanced SP CSI reporting based on suspending and resumingmechanism may improve signaling overhead and/or delay latency foractivation of SP CSI reports. Example embodiments may improve spectrumefficiency of a system when a SP CSI report is triggered based on a MACCE.

FIG. 41 shows an example embodiment of enhanced SP CSI reportingmechanism when the SP CSI reporting is triggered by a DCI. In anexample, a base station (e.g., gNB in FIG. 41) may transmit to awireless device (e.g., UE in FIG. 41) one or more RRC messagescomprising one or more BWP configuration parameters of one or more BWPsof a cell. The one or more RRC messages may further indicate a BWP timervalue of a BWP inactivity timer. The one or more BWPs may comprise adefault BWP. The cell may be a PCell or a SCell. The one or more BWPconfiguration parameters of a BWP of the one or more BWPs may compriseat least one of: a BWP index; one or more RS (e.g., SSB/CSI-RS) resourcesettings; one or more CSI reporting settings; and one CSI measurementsetting.

In an example, a first BWP (e.g., BWP 1 in FIG. 41) may be an active BWPon which a gNB may communicate with a UE. The first BWP may be a DL BWPor an UL BWP. In an example, as shown in FIG. 41, the UE may receive aDCI indicating activation of SP CSI reporting on PUSCH. After or inresponse to the DCI, the UE may transmit one or more SP CSI reports viaa PUSCH resource of an active UL BWP (e.g., the first BWP when the firstBWP is an UL BWP), according to a SP CSI reporting configurationindicated by the DCI. The UE may transmit the one or more SP CSI reportswith a report periodicity via a PUSCH resource of the active UL BWP. Theone or more SP CSI reports may be measured based on one or more RSs(e.g., SSBs/CSI-RSs) on a DL BWP. The UE may start (or restart) a BWPinactivity timer after or in response to receiving via the DL BWP adownlink assignment or an uplink grant.

In an example, as shown in FIG. 41, a base station may transmit to a UEa first DCI indicating an active BWP switching from a first BWP (e.g.,BWP 1 in FIG. 41) to a second BWP (e.g., BWP 2 in FIG. 41). The secondBWP may be a DL BWP or an UL BWP. In an example, after or in response tothe first DCI, the UE may suspend transmissions of SP CSI reports on thefirst BWP (e.g., when the first DCI indicating an active UL BWPswitching). In an example, after or in response to the first DCI, the UEmay stop transmissions of SP CSI reports on the first BWP (e.g., whenthe first DCI indicating an active UL BWP switching). In an example,after or in response to the first DCI, the UE may deactivate an activeSP CSI reporting configuration associated with the SP CSI reports on thefirst BWP (e.g., when the first DCI indicating an active UL BWPswitching). In an example, deactivating the active SP CSI reportingconfiguration may comprising clearing or releasing one or moreconfiguration parameters (e.g., RRC layer, MAC layer, and/or physicallayer) of the SP CSI reporting configuration. In an example, the UE maysuspend the transmissions of SP CSI reports on the first BWP after or inresponse to an expiry of a BWP inactivity timer. In an example, after orin response to the first DCI, the UE may suspend transmissions of SP CSIreports for the first BWP (e.g., when the first DCI indicating an activeDL BWP switching). In an example, the UE may suspend the transmissionsof SP CSI reports for the first BWP after or in response to an expiry ofa BWP inactivity timer.

In an example, the UE may receive a second DCI indicating the active BWPswitching from the second BWP to the first BWP. The UE may notautomatically resume the transmissions of SP CSI reports after or inresponse to receiving the second DCI. In an example, the UE may resumethe transmissions of the SP CSI reports after or in response toreceiving the second DCI and a third DCI indicating an activation of theSP CSI reports. In an example, the second DCI and the third DCI may betransmitted in a DCI format comprising first field(s) indicating activeBWP switching from the second BWP to the first BWP and second field(s)indicating re-activation of SP CSI reports. In an example, the secondDCI and the third DCI may be transmitted in two DCI formats, a first DCIformat comprising fields indicating active BWP switching from the secondBWP to the first BWP, and a second DCI format comprising fieldsindicating (re-)activation of the SP CSI reports. In the exampleembodiment, when transmission of SP CSI reports is triggered based on aDCI, a UE may suspend SP CSI reports and/or deactivate the SP CSIreports when the UE switches away from a BWP and resume the SP CSIreports and/or (re)activate the SP CSI reports when the UE switches backto the BWP and the UE receives (re-)activation of the SP CSI reports. Inan example, (re-)activation of the SP CSI reports by a DCI is convenientand efficient for a gNB, compared with a MAC CE based activation of SPCSI reports. For example, command of (re-)activation of SP CSI reportingon PUSCH may be carried in a DCI for an active BWP switching. In theexample embodiment, explicit (re-)activation of SP CSI reports by a DCIwhen switching back to a BWP may enable a gNB flexibly control a UE'stransmission of the SP CSI reports. In the example embodiment, a gNB maytransmit one or more RSs (e.g., SSBs/CSI-RSs) on the first BWP when thegNB determine to (re-)activate the SP CSI report for the first BWP,e.g., when the first BWP is a DL BWP. In the example embodiment,explicit (re-)activation of SP CSI reports by a DCI when switching backto a BWP may enable a gNB flexibly control a time for RSs (e.g.,SSBs/CSI-RSs) transmission, reduce power consumption of a base station,and/or reduce interference to neighbor base stations/cells. Exampleembodiments may reduce power consumption of a UE. Example embodimentsmay improve spectrum efficiency of a system when a SP CSI report istriggered based on a DCI.

In an example, a wireless device may receive one or more MAC CEcomprising one or more parameters indicating activation of one or moreSP CSI reports of a first BWP (e.g., DL or UL). In an example, thewireless device may communicate with a base station on the first BWPwhen the first BWP is an active BWP. The wireless device may transmit,after or in response to the one or more MAC CE, the one or more SP CSIreports. In an example, the one or more CSI parameters may comprise atleast one of: CQI; PMI; L1-RSRP; RI; and/or CRI. The wireless device maytransmit the one or more SP CSI reports on the first BWP (e.g., when thefirst BWP is an UL BWP). The wireless device may transmit the one ormore SP CSI reports for the first BWP (e.g., when the first BWP is a DLBWP).

In an example, the wireless device may receive a first DCI comprisingone or more parameters indicating a second BWP as the active BWP. In anexample, the second BWP is different from the first BWP. The wirelessdevice may suspend the transmission of the one or more SP CSI reports,after or in response to receiving the first DCI. The wireless device maysuspend the transmission of the one or more SP CSI reports, in responseto an expiry of a BWP inactivity timer.

In an example, the wireless device may receive a second DCI comprisingone or more parameters indicating the first BWP as the active BWP. Thewireless device may resume the transmission of the one or more SP CSIreports, in response to receiving the second DCI. The wireless devicemay resume the transmission of the one or more SP CSI reports, inresponse to an expiry of a BWP inactivity timer. The wireless device mayresume the transmission of the one or more SP CSI reports, in responseto an expiry of a BWP inactivity timer and the first BWP being a defaultBWP.

In an example, a wireless device may receive a first DCI comprising oneor more parameters indicating activation of one or more SP CSI reportsof a first BWP (e.g., DL or UL). The wireless device may transmit, afteror in response to the first DCI, the one or more SP CSI reportscomprising one or more CSI parameters. In an example, the one or moreCSI parameters may comprise at least one of: CQI; PMI; L1-RSRP; RI;and/or CRI.

In an example, the wireless device may receive a second DCI comprisingone or more parameters indicating a second BWP as an active BWP. In anexample, the second BWP is different from the first BWP. The wirelessdevice may suspend the transmission of the one or more SP CSI reports,after or in response to receiving the second DCI. The wireless devicemay suspend the transmission of the one or more SP CSI reports, inresponse to an expiry of a BWP inactivity timer. The wireless device maydeactivate the one or more SP CSI reports, after or in response toreceiving the second DCI. The wireless device may stop transmission ofthe one or more SP CSI reports, after or in response to receiving thesecond DCI. In an example, deactivating the one or more SP CSI reportsmay comprising clearing or releasing one or more configurationparameters (e.g., RRC layer, MAC layer, and/or physical layer) of a SPCSI reporting configuration associated with the one or more SP CSIreports. The SP CSI reporting configuration may be activated in a DCI(e.g., the first DCI).

In an example, the wireless device may receive third DCI(s) comprisingone or more parameters indicating the first BWP as the active BWP and(re-)activation of the one or more SP CSI reports. The wireless devicemay transmit the one or more SP CSI reports, in response to receivingthe third DCI(s). The wireless device may resume the transmission of theone or more SP CSI reports, in response to receiving the third DCI(s).The wireless device may resume the transmission of the one or more SPCSI reports, in response to an expiry of a BWP inactivity timer. Thewireless device may resume the transmission of the one or more SP CSIreports, in response to an expiry of a BWP inactivity timer and thefirst BWP being a default BWP (e.g., DL or UL).

According to various embodiments, a device such as, for example, awireless device, off-network wireless device, a base station, a corenetwork device, and/or the like, may comprise one or more processors andmemory. The memory may store instructions that, when executed by the oneor more processors, cause the device to perform a series of actions.Embodiments of example actions are illustrated in the accompanyingfigures and specification. Features from various embodiments may becombined to create yet further embodiments.

FIG. 42 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4210, by a wireless device may receive a medium accesscontrol control element indicating an activation of a semi-persistentchannel state information (CSI) report configuration for semi-persistentCSI reports on a first bandwidth part. At 4220, the semi-persistent CSIreport configuration may be activated. At 4230, the semi-persistent CSIreports may be transmitted based on one or more parameters of thesemi-persistent CSI report configuration. At 4240, a first downlinkcontrol information may be received. The first downlink controlinformation may indicate switching from the first bandwidth part to asecond bandwidth part as an active bandwidth part. At 4250, thetransmitting the semi-persistent CSI reports may be suspended after orin response to receiving the first downlink control information. At4260, a second downlink control information may be received. The seconddownlink control information may indicate switching to the firstbandwidth part as the active bandwidth part. At 4270, thesemi-persistent CSI reports may be transmitted, after or in response to,receiving the second downlink control information.

According to an example embodiment, the wireless device may transmit viaa physical uplink shared channel, the semi-persistent CSI reportsmeasured on at least one reference signal resource indicated by at leastone of the one or more parameters of the semi-persistent CSI reportconfiguration. According to an example embodiment, the semi-persistentCSI reports may a value of channel quality indicator. According to anexample embodiment, the semi-persistent CSI reports may a value ofprecoding matrix index. According to an example embodiment, thesemi-persistent CSI reports may a value of rank indicator. According toan example embodiment, the semi-persistent CSI reports may a value oflayer 1 reference signal received power. According to an exampleembodiment, a BWP inactivity timer may be started with a timer value inresponse to receiving the first downlink control information indicatingswitching from the first bandwidth part to the second bandwidth part asthe active bandwidth part. According to an example embodiment, thesecond downlink control information may not comprise fields indicatingan activation or deactivation of the semi-persistent CSI reportconfiguration. According to an example embodiment, a radio resourcecontrol message may be received. The radio resource control message maycomprise configuration parameters of multiple bandwidth parts of a cell.The configuration parameters may indicate the multiple bandwidth partscomprising the first bandwidth part and the second bandwidth part. Theconfiguration parameters may indicate a timer value for a bandwidth partinactivity timer. The configuration parameters may indicate multiplesemi-persistent CSI report configurations comprising the semi-persistentCSI report configuration. According to an example embodiment, the cellmay comprise a primary cell or a secondary cell. According to an exampleembodiment, one or more bandwidth part parameters of the first bandwidthpart may comprise a parameter of a frequency location. The one or morebandwidth part parameters of the first bandwidth part may comprise avalue of a first bandwidth. The one or more bandwidth part parameters ofthe first bandwidth part may comprise a value of a subcarrier spacing.The one or more bandwidth part parameters of the first bandwidth partmay comprise a value of a cyclic prefix. The one or more bandwidth partparameters of the first bandwidth part may comprise the value of thefirst bandwidth of the first bandwidth part may be smaller than or equalto a value of a second bandwidth of a cell.

According to an example embodiment, one or more bandwidth partparameters of the second bandwidth part may comprise a parameter of afrequency location. The one or more bandwidth part parameters of thesecond bandwidth part may comprise a value of a first bandwidth. The oneor more bandwidth part parameters of the second bandwidth part maycomprise a value of a subcarrier spacing. The one or more bandwidth partparameters of the second bandwidth part may comprise a value of a cyclicprefix. According to an example embodiment, the value of the firstbandwidth of the second bandwidth part may be smaller than or equal to avalue of a second bandwidth of a cell.

According to an example embodiment, the wireless device may transmit thesemi-persistent CSI reports via a physical uplink control channelresource indicated by at least one of the one or more parameters of thesemi-persistent CSI report configuration. According to an exampleembodiment, the physical uplink control channel may be associated withthe semi-persistent CSI report configuration.

According to an example embodiment, a BWP inactivity timer may bestarted with a timer value in response to receiving the first downlinkcontrol information indicating switching from the first bandwidth partto the second bandwidth part as the active bandwidth part. According toan example embodiment, a third downlink control information on thesecond bandwidth part may be received. According to an exampleembodiment, data packets, may be received, based on the third downlinkcontrol information.

According to an example embodiment, the one or more parameters of thesemi-persistent CSI report configuration may comprise a CSI reportconfiguration type indicator indicating a periodic, semi-persistent, oraperiodic report configuration. The one or more parameters of thesemi-persistent CSI report configuration may comprise one or morereference signal resource configuration parameters. The one or moreparameters of the semi-persistent CSI report configuration may compriseone or more report quantity parameters. The one or more parameters ofthe semi-persistent CSI report configuration may comprise one or morereport frequency domain configuration parameters. The one or moreparameters of the semi-persistent CSI report configuration may compriseone or more physical uplink control channel resources. The one or moreparameters of the semi-persistent CSI report configuration may compriseone or more report time domain configuration parameters. According to anexample embodiment, the semi-persistent CSI reports may be obtainedbased on one or more reference signal time resources indicated by theone or more reference signal resource configuration parameters.According to an example embodiment, the semi-persistent CSI reports maybe obtained based on one or more reference signal frequency resourcesindicated by the one or more report frequency domain configurationparameters. According to an example embodiment, the one or more reportquantity parameters may indicate one or more report quantities. The oneor more report quantities may comprise a channel quality indicator. Theone or more report quantities may comprise a precoding matrix index. Theone or more report quantities may comprise a rank indicator. The one ormore report quantities may comprise a layer 1 reference signal receivedpower. According to an example embodiment, the wireless device maytransmit the semi-persistent CSI reports comprising one or more reportquantities, indicated by the one or more report quantity parameters ofthe semi-persistent CSI report configuration. According to an exampleembodiment, the wireless device may transmit the semi-persistent CSIreports via a physical uplink control channel resource of one or morephysical uplink control channel resources of the semi-persistent CSIreport configuration.

FIG. 43 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4310, a base station may transmit a medium access controlcontrol element. The medium access control control element may indicatean activation of a semi-persistent CSI report configuration forsemi-persistent CSI reports on a first bandwidth part for a wirelessdevice. At 4320, after or in response to receiving the medium accesscontrol control element, the semi-persistent CSI reports from thewireless device may be received. At 4330, a first downlink controlinformation may be transmitted. The first downlink control informationmay indicate a switching of a second bandwidth part to an active statefor the wireless device. At 4340, after or in response to transmittingthe first downlink control information, the receiving thesemi-persistent CSI reports may be suspended. At 4350, a second downlinkcontrol information may be transmitted. The second downlink controlinformation may indicate switching the first bandwidth part to activestate for the wireless device. At 4360, after or in response totransmitting the second downlink control information, thesemi-persistent CSI reports may be received.

According to an example embodiment, the base station may receive, fromthe wireless device and via a physical uplink shared channel, thesemi-persistent CSI reports measured on at least one reference signalresource indicated by at least one of one or more parameters of thesemi-persistent CSI report configuration. According to an exampleembodiment, the semi-persistent CSI reports may comprise a value ofchannel quality indicator. According to an example embodiment, thesemi-persistent CSI reports may comprise a value of precoding matrixindex. According to an example embodiment, the semi-persistent CSIreports may comprise a value of rank indicator. According to an exampleembodiment, the semi-persistent CSI reports may comprise a value oflayer 1 reference signal received power. According to an exampleembodiment, a BWP inactivity timer may be started with a timer value forthe wireless device in response to transmitting the first downlinkcontrol information indicating switching from the first bandwidth partto the second bandwidth part as an active bandwidth part. According toan example embodiment, the second downlink control information may notcomprise fields indicating an activation or deactivation of thesemi-persistent CSI report configuration. According to an exampleembodiment, a radio resource control message may be transmitted. Theradio resource control message may comprise configuration parameters ofmultiple bandwidth parts of a cell. The configuration parameters mayindicate the multiple bandwidth parts comprising the first bandwidthpart and the second bandwidth part. The configuration parameters mayindicate a timer value for a bandwidth part inactivity timer. Theconfiguration parameters may indicate multiple semi-persistent CSIreport configurations comprising the semi-persistent CSI reportconfiguration. According to an example embodiment, the cell may comprisea primary cell or a secondary cell. According to an example embodiment,one or more bandwidth part parameters of the first bandwidth part maycomprise a parameter of a frequency location. According to an exampleembodiment, one or more bandwidth part parameters of the first bandwidthpart may comprise a value of a first bandwidth. According to an exampleembodiment, one or more bandwidth part parameters of the first bandwidthpart may comprise a value of a subcarrier spacing. According to anexample embodiment, one or more bandwidth part parameters of the firstbandwidth part may comprise a value of a cyclic prefix. According to anexample embodiment, the value of the first bandwidth of the firstbandwidth part may be smaller than or equal to a value of a secondbandwidth of a cell. According to an example embodiment, one or morebandwidth part parameters of the second bandwidth part may comprise aparameter of a frequency location. According to an example embodiment,one or more bandwidth part parameters of the second bandwidth part maycomprise a value of a second bandwidth. According to an exampleembodiment, one or more bandwidth part parameters of the secondbandwidth part may comprise a value of a subcarrier spacing. Accordingto an example embodiment, one or more bandwidth part parameters of thesecond bandwidth part may comprise a value of a cyclic prefix. Accordingto an example embodiment, the value of the second bandwidth of thesecond bandwidth part may be smaller than or equal to a value of secondbandwidth of a cell. According to an example embodiment, the basestation may receive the semi-persistent CSI reports via a physicaluplink control channel resource indicated by at least one of one or moreparameters of the semi-persistent CSI report configuration. According toan example embodiment, the physical uplink control channel resource maybe associated with the semi-persistent CSI report configuration.

According to an example embodiment, a BWP inactivity timer may bestarted with a timer value in response to transmitting the firstdownlink control information indicating switching from the firstbandwidth part to the second bandwidth part as an active bandwidth part.According to an example embodiment, a third downlink control informationmay be transmitted on the second bandwidth part. According to an exampleembodiment, data packets may be transmitted based on the third downlinkcontrol information. According to an example embodiment, one or moreparameters of the semi-persistent CSI report configuration may comprisea CSI report configuration type indicator indicating a periodic,semi-persistent, or aperiodic report configuration. According to anexample embodiment, one or more parameters of the semi-persistent CSIreport configuration may comprise one or more reference signal resourceconfiguration parameters. According to an example embodiment, one ormore parameters of the semi-persistent CSI report configuration maycomprise one or more report quantity parameters. According to an exampleembodiment, one or more parameters of the semi-persistent CSI reportconfiguration may comprise one or more report frequency domainconfiguration parameters. According to an example embodiment, one ormore parameters of the semi-persistent CSI report configuration maycomprise one or more physical uplink control channel resources.According to an example embodiment, one or more parameters of thesemi-persistent CSI report configuration may comprise one or more reporttime domain configuration parameters. According to an exampleembodiment, the semi-persistent CSI reports may be obtained based on oneor more reference signal time resources indicated by the one or morereference signal resource configuration parameters. According to anexample embodiment, the semi-persistent CSI reports may be obtainedbased on one or more reference signal frequency resources indicated bythe one or more report frequency domain configuration parameters.According to an example embodiment, the one or more report quantityparameters may indicate one or more report quantities. The one or morereport quantities may comprise a channel quality indicator. The one ormore report quantities may comprise a precoding matrix index. The one ormore report quantities may comprise a rank indicator. The one or morereport quantities may comprise a layer 1 reference signal receivedpower. According to an example embodiment, the base station may receivethe semi-persistent CSI reports comprising one or more reportquantities, indicated by the one or more report quantity parameters ofthe semi-persistent CSI report configuration. According to an exampleembodiment, the base station may receive the semi-persistent CSI reportsvia a physical uplink control channel resource of one or more physicaluplink control channel resources of the semi-persistent CSI reportconfiguration.

FIG. 44 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4410, a medium access control control element may bereceived. The medium access control control element may indicate anactivation of a semi-persistent channel state information (CSI) reportconfiguration for semi-persistent CSI reports on a first bandwidth part.At 4420, after or in response to receiving the medium access controlcontrol element, the semi-persistent CSI reports may be transmittedbased on one or more parameters of the semi-persistent CSI reportconfiguration. At 4430, a first downlink control information may bereceived. The first downlink control information may indicate switchingfrom the first bandwidth part to a second bandwidth part as an activebandwidth part. At 4440, after or in response to receiving the firstdownlink control information, the transmitting the semi-persistent CSIreports may be suspended.

FIG. 45 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4510, semi-persistent CSI reports for a semi-persistentCSI report configuration on a first bandwidth part may be transmitted.At 4520, a first downlink control information may be received. The firstdownlink control information may indicate switching from the firstbandwidth part to a second bandwidth part as an active bandwidth part.At 4530, the transmitting of the semi-persistent CSI reports may besuspended after or in response to receiving the first downlink controlinformation. At 4540, a second downlink control information may bereceived. The second downlink control information may indicate switchingto the first bandwidth part as the active bandwidth part. At 4550, afteror in response to receiving the second downlink control information, thesemi-persistent CSI reports may be transmitted. According to an exampleembodiment, a medium access control control element may be received. Themedium access control control element may indicate an activation of thesemi-persistent CSI report configuration. According to an exampleembodiment, the semi-persistent CSI report configuration may beactivated after or in response to receiving the medium access controlcontrol element.

FIG. 46 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4610, a first downlink control information may bereceived. The first downlink control information may indicate switchingfrom a first bandwidth part to a second bandwidth part as an activebandwidth part. At 4620, transmissions of semi-persistent CSI reports onthe first bandwidth part may be suspended after or in response toreceiving the first downlink control information. At 4630, a seconddownlink control information may be received. The second downlinkcontrol information may indicate switching to the first bandwidth partas the active bandwidth part. At 4640, the semi-persistent CSI reportson the first bandwidth part may be transmitted after or in response toreceiving the second downlink control information.

According to an example embodiment, a medium access control controlelement may be received. The medium access control control element mayindicate an activation of a semi-persistent CSI report configuration.According to an example embodiment, the semi-persistent CSI reportconfiguration may be activated after or in response to receiving themedium access control control element. According to an exampleembodiment, the semi-persistent CSI reports may be transmitted based onthe semi-persistent CSI report configuration.

FIG. 47 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4710, one or more messages may be received. The one ormore messages may comprise configuration parameters of a cell. Theconfiguration parameters may indicate one or more semi-persistent CSIreport configurations on a first BWP. At 4720, a medium access controlcontrol element may be received. The medium access control controlelement may indicate an activation of one of the one or moresemi-persistent CSI report configurations. At 4730, the one of the oneor more semi-persistent CSI report configurations may be activated afteror in response to receiving the medium access control control element.At 4740, semi-persistent CSI reports may be transmitted, on the firstBWP, based on the one of the one or more semi-persistent CSI reportconfigurations. At 4750 a downlink control information may be received.The downlink control information may indicate switching from the firstBWP to a second BWP as an active BWP. At 4760, the transmitting thesemi-persistent CSI reports may be suspended after or in response toreceiving the downlink control information.

According to an example embodiment, a second downlink controlinformation may be received. The second downlink control information mayindicate switching to the first BWP as the active BWP. According to anembodiment, the transmitting of the semi-persistent CSI reports on thefirst BWP may be resumed after or in response to receiving the seconddownlink control information.

FIG. 48 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4810, a wireless device may receive a first downlinkcontrol information. The first downlink control information may indicatean activation of a semi-persistent CSI report configuration of a firstbandwidth part. At 4820, the semi-persistent CSI report configurationmay be activated after or in response to receiving the first downlinkcontrol information. At 4830, CSI reports may be transmitted, on thefirst bandwidth part, based on the semi-persistent CSI reportconfiguration. At 4840, a second downlink control information may bereceived. The second downlink control information may indicate switchingfrom the first bandwidth part to a second bandwidth part as an activebandwidth part. At 4850, the transmitting of the CSI reports may besuspended after or in response to receiving the first downlink controlinformation. At 4860, at least a third downlink control information maybe received. The at least a third downlink control information mayindicate switching from the second bandwidth part to the first bandwidthpart as the active bandwidth part. The at least a third downlink controlinformation may indicate the activation of the semi-persistent CSIreport configuration. At 4870, the CSI reports on the first bandwidthpart may be transmitted after or in response to receiving the at leastthe third downlink control information.

FIG. 49 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 4910, a wireless device may receive a first downlinkcontrol information. The first downlink control information may indicatean activation of a semi-persistent CSI report configuration for a firstbandwidth part. At 4920, the semi-persistent CSI report configurationmay be activated after or in response to receiving the first downlinkcontrol information. At 4930, CSI reports for the first bandwidth partmay be transmitted based on the semi-persistent CSI reportconfiguration. At 4940, a second downlink control information may bereceived. The second downlink control information may indicate switchingfrom the first bandwidth part to a second bandwidth part as an activebandwidth part. At 4950, the transmitting the CSI reports for the firstbandwidth part may be suspended after or in response to receiving thefirst downlink control information. At 4960, at least a third downlinkcontrol information may be received. The at least a third downlinkcontrol information may indicate switching from the second bandwidthpart to the first bandwidth part as the active bandwidth part. The atleast a third downlink control information may indicate the activationof the semi-persistent CSI report configuration. At 4970, the CSIreports for the first bandwidth part may be transmitted after or inresponse to receiving the at least the third downlink controlinformation.

FIG. 50 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 5010, a first downlink control information may bereceived. The first downlink control information may indicate anactivation of a semi-persistent CSI report configuration on a firstbandwidth part. At 5020, after or in response to receiving the firstdownlink control information and via the first bandwidth part,semi-persistent CSI reports based on the semi-persistent CSI reportconfiguration may be transmitted. At 5030, a second downlink controlinformation may be received. The second downlink control information mayindicate switching from the first bandwidth part to a second bandwidthpart as an active bandwidth part. At 5040, after or in response toreceiving the second downlink control information, the transmitting thesemi-persistent CSI reports via the first bandwidth part may besuspended.

According to an embodiment, a third downlink control information may bereceived. The third downlink control information may indicate switchingto the first bandwidth part as the active bandwidth part. According toan embodiment, a fourth downlink control information may be receivedthat indicates re-activation of the semi-persistent CSI reportconfiguration. According to an embodiment, the transmitting thesemi-persistent CSI reports via the first bandwidth part may be resumedin response to the third downlink control information and the fourthdownlink control information. According to an embodiment, at least athird downlink control information may be received. The at least a thirddownlink control information may indicate switching to the firstbandwidth part as the active bandwidth part. The at least a thirddownlink control information may indicate the activation of thesemi-persistent CSI report configuration. According to an embodiment,the transmitting the semi-persistent CSI reports via the first bandwidthpart may be resumed after or in response to the at least the thirddownlink control information.

FIG. 51 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 5110, one or more messages may be received. The one ormore messages may comprise configuration parameters of a cell. The cellmay comprise a first downlink bandwidth part (BWP). The cell maycomprise a second downlink BWP. The cell may comprise at least oneuplink BWP. The configuration parameters may comprise first parametersof first uplink control channel resource on the at least one uplink BWPfor first channel state information reports of the first downlink BWP.The configuration parameters may comprise second parameters of seconduplink control channel resource on the at least one uplink BWP forsecond channel state information reports of the second downlink BWP. At5120, the first channel state information reports of the first downlinkBWP may be transmitted via the first uplink control channel resource onan uplink BWP of the at least one uplink BWP. At 5130, an active BWP mayswitch from the first downlink BWP to the second downlink BWP. At 5140,after the switching, the second channel state information reports of thesecond downlink BWP may be transmitted via the second uplink controlchannel resource on the uplink BWP of the at least one uplink BWP.

According to an example embodiment, the configuration parameters maycomprise one or more BWP parameters of the first downlink BWP. The oneor more BWP parameters may comprise a parameter of frequency location.The one or more BWP parameters may comprise a value of bandwidth. Theone or more BWP parameters may comprise a value of subcarrier spacing.The one or more BWP parameters may comprise a value of cyclic prefix.

According to an example embodiment, the configuration parameters maycomprise one or more BWP parameters of the second downlink BWP. The oneor more BWP parameters may comprise a parameter of frequency location.The one or more BWP parameters may comprise a value of bandwidth. Theone or more BWP parameters may comprise a value of subcarrier spacing.The one or more BWP parameters may comprise a value of cyclic prefix.

According to an example embodiment, the first downlink BWP may beactivated as the active BWP. According to an example embodiment, thefirst channel state information reports may comprise a BWP identifierindicating the first downlink BWP. According to an example embodiment,the second channel state information reports may comprise a BWPidentifier indicating the second downlink BWP.

According to an example embodiment, at least one the first channel stateinformation reports or the second channel state information reports maycomprise a value of channel quality indicator. According to an exampleembodiment, at least one the first channel state information reports orthe second channel state information reports may comprise a value ofprecoding matrix index. According to an example embodiment, at least onethe first channel state information reports or the second channel stateinformation reports may comprise a value of rank indicator. According toan example embodiment, at least one the first channel state informationreports or the second channel state information reports may comprise avalue of layer 1 reference signal received power.

According to an example embodiment, a downlink control channel of thesecond downlink BWP may be monitored in response to receiving a downlinkcontrol information indicating switching to the second downlink BWP asthe active BWP. According to an example embodiment, the first channelstate information reports may be based on one or more reference signaltime resource configuration of the first downlink BWP. According to anexample embodiment, the first channel state information reports may bebased on one or more reference signal frequency resource configurationof the first downlink BWP. According to an example embodiment, thesecond channel state information reports may be based on one or morereference signal time resource configuration of the second downlink BWP.According to an example embodiment, the second channel state informationreports may be based on one or more reference signal frequency resourceconfiguration of the second downlink BWP. According to an exampleembodiment, the switching may be in response to receiving a downlinkcontrol information indicating switching from the first downlink BWP tothe second downlink BWP as the active BWP.

According to an example embodiment, a command indicating an activationof a first channel state information report configuration may bereceived. According to an example embodiment, the first channel stateinformation report configuration for the first channel state informationreports may be activated in response to the command. According to anexample embodiment, the command may comprise at least a medium accesscontrol control element. According to an example embodiment, the commandmay comprise at least a downlink control information. According to anexample embodiment, the switching may be in response to an expiry of aBWP inactivity timer of the cell. According to an example embodiment,the second downlink BWP may be a default BWP. According to an exampleembodiment, the BWP inactivity timer may be configured in an RRCmessage.

According to an example embodiment, a command indicating an activationof a second channel state information report configuration may bereceived. According to an example embodiment, the second channel stateinformation report configuration for the second channel stateinformation reports may be activated in response to receiving thecommand. According to an example embodiment, the command may comprise atleast a medium access control control element. According to an exampleembodiment, the command may comprise at least a downlink controlinformation.

FIG. 52 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 5210, one or more messages may be transmitted from a basestation to a wireless device. The one or more messages may compriseconfiguration parameters of a cell. The cell may comprise a firstdownlink bandwidth part (BWP). The cell may comprise a second downlinkBWP. The cell may comprise at least one uplink BWP. The configurationparameters may comprise first parameters of a first uplink controlchannel resource on the at least one uplink BWP for first channel stateinformation reports of the first downlink BWP. The configurationparameters may comprise second parameters of a second uplink controlchannel resource on the at least one uplink BWP for second channel stateinformation reports of the second downlink BWP. At 5220, the firstchannel state information reports of the first downlink BWP may bereceived via the first uplink control channel resource on an uplink BWPof the at least one uplink BWP from the wireless device. At 5230, thesecond downlink BWP may switch to an active state for the wirelessdevice. At 5240, after the switching, the second channel stateinformation reports of the second downlink BWP may be received from thewireless device via the second uplink control channel resource on theuplink BWP of the at least one uplink BWP.

According to an example embodiment, the configuration parameters maycomprise one or more BWP parameters of the first downlink BWP. The oneor more BWP parameters may comprise a parameter of frequency location.The one or more BWP parameters may comprise a value of bandwidth. Theone or more BWP parameters may comprise a value of subcarrier spacing.The one or more BWP parameters may comprise a value of cyclic prefix.

According to an example embodiment, the configuration parameters maycomprise one or more BWP parameters of the second downlink BWP. The oneor more BWP parameters may comprise a parameter of frequency location.The one or more BWP parameters may comprise a value of bandwidth. Theone or more BWP parameters may comprise a value of subcarrier spacing.The one or more BWP parameters may comprise a value of cyclic prefix.

According to an example embodiment, the first downlink BWP may beactivated as the active BWP for the wireless device. According to anexample embodiment, the first channel state information reports maycomprise a BWP identifier indicating the first downlink BWP. Accordingto an example embodiment, the second channel state information reportsmay comprise a BWP identifier indicating the second downlink BWP.According to an example embodiment, at least one of the first channelstate information reports or the second channel state informationreports may comprise a value of channel quality indicator. According toan example embodiment, at least one of the first channel stateinformation reports or the second channel state information reports maycomprise a value of precoding matrix index. According to an exampleembodiment, at least one of the first channel state information reportsor the second channel state information reports may comprise a value ofrank indicator. According to an example embodiment, at least one of thefirst channel state information reports or the second channel stateinformation reports may comprise a value of layer 1 reference signalreceived power.

According to an example embodiment, a downlink control channel of thesecond downlink BWP may be transmitted in response to transmitting adownlink control information indicating switching to the second downlinkBWP as an active BWP.

According to an example embodiment, the first channel state informationreports may be based on one or more reference signal time resourceconfiguration of the first downlink BWP. According to an exampleembodiment, the first channel state information reports may be based onone or more reference signal frequency resource configuration of thefirst downlink BWP. According to an example embodiment, the secondchannel state information reports may be based on one or more referencesignal time resource configuration of the second downlink BWP. Accordingto an example embodiment, the second channel state information reportsmay be based on one or more reference signal frequency resourceconfiguration of the second downlink BWP.

According to an example embodiment, the switching may be in response totransmitting a downlink control information indicating switching fromthe first downlink BWP to the second downlink BWP as an active BWP.

According to an example embodiment, a command indicating an activationof a first channel state information report configuration for the firstchannel state information reports may be transmitted. According to anexample embodiment, the first channel state information reportconfiguration for the first channel state information reports may beactivated in response to the command. According to an exampleembodiment, the command may comprise at least a medium access controlcontrol element. According to an example embodiment, the command maycomprise at least a downlink control information. According to anexample embodiment, the switching may be in response to an expiry of aBWP inactivity timer of the cell. According to an example embodiment,the second downlink BWP may be a default BWP. According to an exampleembodiment, the BWP inactivity timer may be configured in an RRCmessage.

According to an example embodiment, a command indicating an activationof a second channel state information report configuration for thesecond channel state information reports for the wireless device may betransmitted. According to an example embodiment, the second channelstate information report configuration for the second channel stateinformation reports may be activated in response to transmitting thecommand. According to an example embodiment, the command may comprise atleast a medium access control control element. According to an exampleembodiment, the command may comprise at least a downlink controlinformation.

FIG. 53 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 5310, a wireless device may activate a firstsemi-persistent CSI configuration of a first downlink BWP of a cell. Thewireless device may activate a second semi-persistent CSI configurationof a second downlink BWP of the cell. At 5320, first semi-persistent CSIreports for the first semi-persistent CSI configuration of the firstdownlink BWP may be transmitted via a first uplink control channelresource on an uplink BWP. At 5330, an active BWP may switch from thefirst downlink BWP to a second downlink BWP. At 5340, after theswitching and via a second uplink control channel resource on the uplinkBWP, second semi-persistent CSI reports for the second semi-persistentCSI configuration of the second downlink BWP may be transmitted.

FIG. 54 is a flow diagram of an aspect of an embodiment of the presentdisclosure. At 5410, a wireless device may transmit firstsemi-persistent CSI reports for a first downlink BWP of a cell via afirst uplink control channel resource on an uplink BWP. At 5420, anactive BWP of the cell may switch from the first downlink BWP to asecond downlink BWP. At 5430, after the switching and via a seconduplink control channel resource on the uplink BWP, secondsemi-persistent CSI reports for the second downlink BWP may betransmitted.

In this disclosure, “a” and “an” and similar phrases are to beinterpreted as “at least one” or “one or more.” Similarly, any term thatends with the suffix “(s)” is to be interpreted as “at least one” or“one or more.” In this disclosure, the term “may” is to be interpretedas “may, for example.” In other words, the term “may” is indicative thatthe phrase following the term “may” is an example of one of a multitudeof suitable possibilities that may, or may not, be employed to one ormore of the various embodiments. If A and B are sets and every elementof A is also an element of B, A is called a subset of B. In thisspecification, only non-empty sets and subsets are considered. Forexample, possible subsets of B={cell1, cell2} are: {cell1}, {cell2}, and{cell1, cell2}. The phrase “based on” is indicative that the phrasefollowing the term “based on” is an example of one of a multitude ofsuitable possibilities that may, or may not, be employed to one or moreof the various embodiments. The phrase “in response to” is indicativethat the phrase following the phrase “in response to” is an example ofone of a multitude of suitable possibilities that may, or may not, beemployed to one or more of the various embodiments. The terms“including” and “comprising” should be interpreted as meaning“including, but not limited to.”

In this disclosure and the claims, differentiating terms like “first,”“second,” “third,” identify separate elements without implying anordering of the elements or functionality of the elements.Differentiating terms may be replaced with other differentiating termswhen describing an embodiment.

In this disclosure, various embodiments are disclosed. Limitations,features, and/or elements from the disclosed example embodiments may becombined to create further embodiments within the scope of thedisclosure.

In this disclosure, parameters (Information elements: IEs) may compriseone or more objects, and each of those objects may comprise one or moreother objects. For example, if parameter (IE) N comprises parameter (IE)M, and parameter (IE) M comprises parameter (IE) K, and parameter (IE) Kcomprises parameter (information element) J, then, for example, Ncomprises K, and N comprises J. In an example embodiment, when one ormore messages comprise a plurality of parameters, it implies that aparameter in the plurality of parameters is in at least one of the oneor more messages, but does not have to be in each of the one or moremessages.

Furthermore, many features presented above are described as beingoptional through the use of “may” or the use of parentheses. For thesake of brevity and legibility, the present disclosure does notexplicitly recite each and every permutation that may be obtained bychoosing from the set of optional features. However, the presentdisclosure is to be interpreted as explicitly disclosing all suchpermutations. For example, a system described as having three optionalfeatures may be embodied in seven different ways, namely with just oneof the three possible features, with any two of the three possiblefeatures or with all three of the three possible features.

Many of the elements described in the disclosed embodiments may beimplemented as modules. A module is defined here as an isolatableelement that performs a defined function and has a defined interface toother elements. The modules described in this disclosure may beimplemented in hardware, software in combination with hardware,firmware, wetware (i.e. hardware with a biological element) or acombination thereof, all of which are behaviorally equivalent. Forexample, modules may be implemented as a software routine written in acomputer language configured to be executed by a hardware machine (suchas C, C++, Fortran, Java, Basic, Matlab or the like) or amodeling/simulation program such as Simulink, Stateflow, GNU Octave, orLab VIEWMathScript. Additionally, it may be possible to implementmodules using physical hardware that incorporates discrete orprogrammable analog, digital and/or quantum hardware. Examples ofprogrammable hardware comprise: computers, microcontrollers,microprocessors, application-specific integrated circuits (ASICs); fieldprogrammable gate arrays (FPGAs); and complex programmable logic devices(CPLDs). Computers, microcontrollers and microprocessors are programmedusing languages such as assembly, C, C++ or the like. FPGAs, ASICs andCPLDs are often programmed using hardware description languages (HDL)such as VHSIC hardware description language (VHDL) or Verilog thatconfigure connections between internal hardware modules with lesserfunctionality on a programmable device. Finally, it needs to beemphasized that the above mentioned technologies are often used incombination to achieve the result of a functional module.

The disclosure of this patent document incorporates material which issubject to copyright protection. The copyright owner has no objection tothe facsimile reproduction by anyone of the patent document or thepatent disclosure, as it appears in the Patent and Trademark Officepatent file or records, for the limited purposes required by law, butotherwise reserves all copyright rights whatsoever.

While various embodiments have been described above, it should beunderstood that they have been presented by way of example, and notlimitation. It will be apparent to persons skilled in the relevantart(s) that various changes in form and detail can be made thereinwithout departing from the scope. In fact, after reading the abovedescription, it will be apparent to one skilled in the relevant art(s)how to implement alternative embodiments. Thus, the present embodimentsshould not be limited by any of the above described exemplaryembodiments.

In addition, it should be understood that any figures which highlightthe functionality and advantages, are presented for example purposesonly. The disclosed architecture is sufficiently flexible andconfigurable, such that it may be utilized in ways other than thatshown. For example, the actions listed in any flowchart may bere-ordered or only optionally used in some embodiments.

Further, the purpose of the Abstract of the Disclosure is to enable theU.S. Patent and Trademark Office and the public generally, andespecially the scientists, engineers and practitioners in the art whoare not familiar with patent or legal terms or phraseology, to determinequickly from a cursory inspection the nature and essence of thetechnical disclosure of the application. The Abstract of the Disclosureis not intended to be limiting as to the scope in any way.

Finally, it is the applicant's intent that only claims that include theexpress language “means for” or “step for” be interpreted under 35U.S.C. 112. Claims that do not expressly include the phrase “means for”or “step for” are not to be interpreted under 35 U.S.C. 112.

What is claimed is:
 1. A method comprising: receiving one or moremessages comprising configuration parameters of a cell, wherein: thecell comprises a first downlink bandwidth part (BWP), a second downlinkBWP and at least one uplink BWP; and the configuration parameterscomprise: first parameters of a first physical uplink control channel(PUCCH) resource on the at least one uplink BWP, for first channel stateinformation reports of the first downlink BWP, wherein at least one ofthe first channel state information reports comprise a value of layer 1reference signal received power; and second parameters of a second PUCCHresource on the at least one uplink BWP, for second channel stateinformation reports of the second downlink BWP; transmitting, via thefirst PUCCH resource on an uplink BWP of the at least one uplink BWP,the first channel state information reports of the first downlink BWP;switching from the first downlink BWP to the second downlink BWP as anactive BWP; transmitting, after the switching, the second channel stateinformation reports of the second downlink BWP via the second PUCCHresource on the uplink BWP of the at least one uplink BWP, andmonitoring, in response to receiving a downlink control informationindicating switching to the second downlink BWP as the active BWP, adownlink control channel of the second downlink BWP for downlink controlinformation that comprises one or more parameters indicating switchingto the first downlink BWP.
 2. The method of claim 1, wherein theconfiguration parameters further comprises one or more BWP parameters ofthe first downlink BWP, the one or more BWP parameters comprising atleast one of: a parameter of frequency location; a value of bandwidth; avalue of subcarrier spacing; and a value of cyclic prefix.
 3. The methodof claim 1, wherein the configuration parameters further comprises oneor more BWP parameters of the second downlink BWP, the one or more BWPparameters comprising at least one of: a parameter of frequencylocation; a value of bandwidth; a value of subcarrier spacing; and avalue of cyclic prefix.
 4. The method of claim 1, further comprisingactivating the first downlink BWP as the active BWP.
 5. The method ofclaim 1, wherein the first channel state information reports comprise aBWP identifier indicating the first downlink BWP.
 6. The method of claim1, wherein the second channel state information reports comprise a BWPidentifier indicating the second downlink BWP.
 7. The method of claim 1,wherein at least one of the first channel state information reports orthe second channel state information reports comprise at least one of: avalue of channel quality indicator; a value of precoding matrix index;or a value of rank indicator.
 8. The method of claim 1, wherein thefirst channel state information reports are based on: one or morereference signal time resource configuration of the first downlink BWP;and one or more reference signal frequency resource configuration of thefirst downlink BWP.
 9. The method of claim 1, wherein the second channelstate information reports are based on: one or more reference signaltime resource configuration of the second downlink BWP; and one or morereference signal frequency resource configuration of the second downlinkBWP.
 10. The method of claim 1, wherein the switching is in response toreceiving a downlink control information indicating switching from thefirst downlink BWP to the second downlink BWP as the active BWP.
 11. Themethod of claim 1, further comprising: receiving a command indicating anactivation of a first channel state information report configuration;and activating, in response to the command, the first channel stateinformation report configuration for the first channel state informationreports.
 12. The method of claim 11, wherein the command comprises atleast a medium access control control element.
 13. The method of claim11, wherein the command comprises at least a downlink controlinformation.
 14. The method of claim 1, wherein the switching is inresponse to an expiry of a BWP inactivity timer of the cell.
 15. Themethod of claim 14, wherein the second downlink BWP is a default BWP.16. The method of claim 14, wherein the BWP inactivity timer isconfigured in an RRC message.
 17. The method of claim 1, furthercomprising: receiving a command indicating an activation of a secondchannel state information report configuration; and activating, inresponse to receiving the command, the second channel state informationreport configuration for the second channel state information reports.18. The method of claim 17, wherein the command comprises at least amedium access control control element or wherein the command comprisesat least a downlink control information.
 19. The method of claim 1,wherein at least one of the second channel state information reportscomprise a value of layer 1 reference signal received power.